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Archive page lens news rumours 2019

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Archive page of lens news and rumours from 2019

Rumours, news and patents for Canon Lenses and other lens info

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Archived rumours / news / patents and product info related to lenses – mostly Canon and Canon fit.

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2019 New lenses – facts, rumours and speculation

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What does the RF mount mean for EF/EF-M? …an historical perspective
Keith’s review of the EOS RP

2019 December

30th In line with several recent Canon patent applications, expect to see the ‘consumer’ end of Canon’s range of RF lenses to be filled out somewhat in 2020 [CR]

The 24-300 and 17-70 below could all fit in with expanding the range, as well as a few cheaper prime lenses.

27th A Canon Japanese patent application appears for an RF24-300mm f / 4-5.6 [HL]


15th After focus error reports at minimum focus distance for the RF 70-200, it seems that Canon has noticed and a firmware update for the lens is on its way. The problem only showed up for use of the lens at its closest focus distances, where a tendency to front focus has been noticed.

12th A Canon Japanese patent includes examples of what might be RF ‘kit lenses’ [HL]

This 17-72 mm, f / 3.5-5.8 17-72 is full frame, but should easily be a good and relatively cheap lens for the budget conscious. Whilst not a lens I’d have any use for, it’s definitely needed for the EOS R line.

RF 17-72

5th A Canon Japanese patent application [HL] looks at a whole range of ‘soft focus’ 35/1.4 lens designs (and a 24/1.4) The ‘L’ elements in the designs control the soft focus effect.

35_1-4_soft focus

A US Canon lens patent application [USPTO] covers a range of zoom lenses

28-135/4 [below] | 24-170/4 | 18-170/3.6 | 28-270/2.8


The designs cover a range of sensor sizes.

The 18-170 is APS-C and could fit EF-S, whilst the others are full frame except at the wide end. The others are full frame except at the wide end. This mix suggests that these are explorations optical design parameters aimed at reducing aberrations and minimising size rather than specific examples that might appear as products.

As ever, remember that a patent (application) is not a product…

An example of a lens patent that may well be used in real lenses is one that covers making the actual lens aperture closer to what you set it to. The combination of zoom and focus means that the aperture set may not be quite what you get. The lens has some info in its controller that allows for this, but to do it more precisely ups the data storage requirements for the lens – this patent application [USPTO] looks at lowering that.

This is just the sort of improvement that goes into a new lens design, and will never appear in any specs.

4th Venus lens have announced RF/Z mount versions of three lenses (12mm f/2.8 Zero-D, 25mm f/2.8 2.5-5X Ultra Macro and 100mm f/2.8 2X Ultra-Macro)

I’ve detailed reviews of all three using the EF mount (the same optics)


28th A whole range (35mm f/1.8, 20mm f/2, 35mm f/2.8, 45mm f/2.8, 35mm f/2 and 16-34mm f/4 ) of full frame RF primes appear in a Canon Japanese patent application (JP2019-204115 (P2019-204115A) [HL]

All show the ‘rear heavy’ optical designs that the RF mount helps enable, such as this for the 35/1.8

35mm f/1.8

or even more in this 35/2

35mm f2


27th I’ve a new Fotodiox tilt/shift adapter for using my Mamiya M645 lenses on the EOS RP. It’s raher better built that the M645->EF adapter I’ve used for a few years (see this review of M645 lenses on my 1Ds3) and gives ±10º of tilt and ±15mm of shift.  Review on its way ;-)

35 shifted

26th I’ve finished writing up my review of the Laowa 15mm f/2 RF mount lens on the EOS RP. Excellent quality if you are OK with manual lenses.


20th It seems that Sigma will be announcing an RF lens roadmap early next year [CR]

14th A US Canon patent application looks at aspects of diffractive optical elements and includes several (full frame) examples. The 800/11 is only 39cm (~15″) long but hardly sounds a lens I’d rush to add to my collection…

600/8 | 400|5.6 | 400/8 | 800/11 | 600/11

This 400/8 is 25cm long


A Japanese Canon patent application [2019-197095A] includes 25mm/1.2 | 18mm/1.2 and an 18mm f/1.0 in its design examples.

All for full frame, although the back focus (4.99mm) is probably too short for the 18/1.0 [via HL]


11th EF 400mm f/2.8L IS III USM and the EF 600mm f/4L IS III USM have firmware updates.

Firmware Version 1.1.2 incorporates the following enhancements:

  • Increases the manual focus speed when the manual focus speed switch is set to 1 or 2. *The speed when the switch is set to 3 (slowest speed) will be unchanged.
  • Improves the image stabilization effect during handheld shooting with a slow shutter speed when used with EOS 5D Mark IV, EOS 6D, or EOS R.

*Enables a full-time manual focus function during Servo AF when used with the EOS-1D X Mark II. The lens must be sent to the Factory Service Center in order for this function to be enabled.

Lens firmware version can be checked from the camera’s menu. Updates: EF 400mm f/2.8L IS III | EF 600mm f/4L IS III

7th A set of designs for long lenses appear in a Canon patent application [USPTO]

This is the 500/4, whilst other examples fill the ‘standard’  300/2.8 | 400/4 | 800/5.6 range. The designs could be for EF or RF mount. The design looks at how the internal focus system works and could see a designs with improved close focus. As ever, remember that a patent application is not a product, so whilst there will be RF long white lenses eventually, these are just design ideas.

500-f4 lens design

The designs also appear in a Japanese patent [HL]

  • Focal length: 584.99 mm | F no: 4.12
    Image height: 21.64 mm
    Lens length: 476.28 mm
    Back focus: 87.97 mm
  • Focal length: 489.05 mm | F no: 4.12
    Image height: 21.64 mm
    Lens length: 411.08 mm
    Back focus: 86.24 mm
  • Focal length: 392.56 mm | F no: 2.90
    Image height: 21.64 mm
    Lens length: 371.16 mm
    Back focus: 59.99 mm
  • Focal length: 778.44 mm | F no: 5.80
    Image height: 21.64 mm
    Lens length: 489.01 mm
    Back focus: 48.66 mm



25th Samyang have announced a 14mm f/2.8 autofocus lens for RF mount [Samyang 14mm announcement]

24th The RF 85mm f/1.2L USM DS & RF 70-200mm f/2.8L IS USM lenses are finally officially announced by Canon [DPR]

A Canon RF lens patent [USPTO] looks at wide zooms, with a emphasis on the use of aspheric elements

There is this RF14-28 f/2 design amongst others (different versions and f/2.8 examples)


In Japan patents appear covering a RF50/1.8 and RF70-250/4 [HL]

70-250 f450mm f1.8

17th Tokina have announced the ATX-i 11-16mm F2.8 CF lens for Canon EF APS-C [$449 at B&H]


  • 17.6-25.6mm (35mm Equivalent)
  • Aperture Range: f/2.8 to f/22
  • Two Aspherical Elements
  • Two SD Low Dispersion Elements
  • Multi-Coated Elements
  • One-Touch Focus Clutch Mechanism
  • Internal Focusing Design
  • 9-Blade Diaphragm

16th A good lens geek article [Lensrentals] looking at measuring really high res MTF measurements

10th The next announcements from Canon include two lenses we’ve been expecting… [Nok]

  • Canon RF 70-200mm f/2.8L IS USM
  • Canon RF 85mm f/1.2L DS USM

Wondering what other lenses are on the way for the RF mount? Well, Nikon have published a roadmap for the Z mount for up to 2021


7th A few more EF-M options on the way…

Sigma Ships Its F1.4 Mirrorless Trio Contemporary Lenses in Canon EF-M Mount

Ronkonkoma, NY – October 4, 2019 – Sigma Corporation of America, a leading camera, photography lens, cine lens, flash and accessories manufacturer, today announced that its 16mm F1.4 DC DN Contemporary ($449 USD), 30mm F1.4 DC DN Contemporary ($339 USD), and 56mm F1.4 DC DN Contemporary ($479 USD) lenses are now shipping in Canon EF-M mount.

Key Features and Benefits of the F1.4 Mirrorless Trio
Sigma’s F1.4 Mirrorless Trio, 16mm, 30mm, and 56mm F1.4 DC DN Contemporary lenses, all benefit from a fast aperture of F1.4 to achieve sufficient amount of bokeh and admirable brightness even with APS-C size cameras which tend to have smaller bokeh effects compared to 35mm full-size systems. Their compact and lightweight body is perfect for daily use as they cover the range from true wide angle to normal to portrait. Stepping motors ensure smooth, swift, quiet, autofocus for both still and video capture. In addition to Canon M-mount, these products are available for Sony E-mount and Micro four thirds camera systems.

For full product details and technical specifications, please refer to the official press release here.

See the M-Mount F1.4 Mirrorless Trio at PhotoPlus 2019
In addition to Sigma’s full lens lineup, attendees to the 2019 PhotoPlus Expo in New York City can see the all new Sigma 16mm, 30mm, and 56mm F1.4 DC DN Contemporary lenses in M-mount on Sigma booth #837.

3rd Several (IS/USM) RF zoom designs appear in a US patent application [USPTO]

70-200 f/2.8, 70-240 f/4 and 70-300 f/4-5.6

Canon is expected to announce quite a few RF lenses next year…


12th A number of small Canon prime lens designs (RF FF) appear in a Japanese patent application [CN] these look very similar to the US ones of  Aug 29th below.

In US patent applications today [#1, #2], there are a number of 24-70/100/130 designs for RF full frame

There’s also this 24-300 f4-5.6 design (RF FF)


A ‘new and “unique”‘ RF mount macro L lens is suggested [CR] as appearing alongside any high res EOS R body next year.

Another ‘ordinary’ macro is not needed, and whilst the MP-E65 is a good lens I’m sure a rather better version should be possible.

For some good macro design ideas, just see my Laowa reviews

7th The RF15-35 and RF24-70 F2.8L IS are due to ship the 26th of this month

6th An article in Japan mentions Canon’s flagship ‘1 series’ mirrorless [DCI] as a 2021 product [EOS RX page], but also notes that:

“With regard to interchangeable lenses, it is said that the lineup will be equivalent to that of SLR cameras in 3 years, so it seems that we can expect the release of RF lenses at a fast pace.”

That’s a lot of RF lenses to appear…

As a longstanding fan of mirror lens designs I was curious to see this 500-2500mm f/3-16 zoom design from a Fuji Japanese patent [HL]

500-2500mm mirror-lens

Unfortunately, it’s for 1″ sensor sizes ;-)

5th Another 85/1.2 design from a Canon patent [USPTO]

rf85 f/1.2

The patent contains a number of designs from ~75mm to ~95mm and are all full frame with short (~14mm) back focus suggesting RF designs. The key feature would seem to be the element Gp formed by cementing two lenses together.

A second patent application [USPTO] shows some zooms (RF full frame), such as this ~24-100 f/4 design

24-100 f4

The patent also includes a 24-70/2.8, a 24-300 f/4-5.6 (all RF FF)



29th After yesterday’s announcements, today sees quite a few Canon len patent applications at the USPTO

A full frame 85/1.2 for RF mount [USPTO]

rf 85 f1.2

Variations on a design for a 50/1.2 lens for full frame RF [USPTO]

rf50 f/1.2

A patent for smaller (RF full frame) designs starts with a 35/1.8 design [USPTO]

rf35 f/1.8

However as well as this RF16/4 there are plenty of other designs (20/2 | 35/2 | 32/2.8 | 44/2.8)

rf 16-4

28th Two of the lenses are announced, for late September, with the 70-200 later this year [Announcement info]

23rd Three RF lenses due to be announced next week have some prices [CR]

  • Canon RF 15-35mm f/2.8L IS USM 82,600 THB – $2499
  • Canon RF 24-70mm f/2.8L IS USM 82,600 THB – $2499
  • Canon RF 70-200mm f/2.8L IS USM 93,500 THB – $2799

The RF 15-35mm f/2.8L IS USM and RF 24-70mm f/2.8L IS USM should ship in October, with the RF 70-200mm f/2.8L IS USM in December.

22nd RF 17-70A Canon RF17-70 f/3.5-5.6 Japanese patent application is shown [CN]

The variable aperture suggests a kit lens. It’s full frame, but would make a good kit lens for an APS-C EOS R camera.

I really don’t expect to see Canon introduce more complexity in the form of an RF-S mount, so it looks as if moving from a future APS-C EOS-R to a full frame one will just give you a wider angle view with your existing lenses.

The new M6 mk2 shows there’s life in EF-M yet but the mismatch between EF-M and RF mounts still makes me wonder how Canon proposes to move/upsell EF-M users to RF. I also wonder if this is even a real problem, or just one created by those of us who know too much about lenses and lens mounts ;-)

When is a zoom fisheye lens not a zoom fisheye?

The EF8-15 [my review] is a lens I find very useful in capturing large fields of view in a single shot. Unfortunately not many people want out and out ‘fisheye’ views, so I often use software to change the image geometry [See my latest review of the FisheyeHemi software]. There is however a subtlety that is often overlooked, in that the image projection geometry of a fisheye lens is not fixed – there is for example the Samyang 12mm I reviewed a while ago which has an interesting stereographic projection, rather than the normal equidistant (see the 12mm review for examples).

A new lens design patent from Canon [USPTO] shows lens designs that have an adjustable image projection.

They are all short backfocus (mirrorless designs) and project a circular image onto a full frame sensor.


The change of projection is difficult to show, but this graph shows how the difference in image magnification across the field of view can vary.


There are several design examples, all around f/2.8



They do zoom in focal length (5-8mm for example) but the field of view doesn’t change, just the image projection


In the patent, one of the aims is to be able to adjust the magnification of different parts of the field of view.

Produce a version with a longer focal length (to fill a frame with a 180º FOV from corner to corner) and you have a distinctly different RF mount zoom fisheye.

BTW here are two examples from my Samyang 12mm review, showing the difference that a relatively small change in projection makes.



13th There are going to be plenty of RF lenses appearing over the next few years – the latest addition to the queue is an RF equivalent to the 100-400 (maybe a 200-500). As yet no specs or other info though [CR]

12th If you’re curious about how light travels through all those elements in the 50-80 design below, then have a look at the active simulations for the lens at PhotonsToPhotos

optics for 50-80

9th Tamron has issued a compatibility notice for some of its lenses and the Canon EOS R and RP [DPR]

8th A Canon patent application [USPTO] more of use to lens designers figuring out Canon’s lens communications protocols, such as burst communications mode. Concerned with reliability of communications.

You want lens elements? A Canon lens designer has been packing them in, in a patent application [USPTO] for ultra wide aperture zooms

There’s a 50-80 f/1.4 and a 50-80 f/1.2 and a relatively boring 50-80 f/1.8, not to mention the 50-80 f/1.6

Oh, and a 50-8 f/1.1 shown hers…


Full frame and 220mm long, with a back focus of only 6mm so perhaps a version is coming to an RF mount (probably not) near to you…


Ok, maybe that backfocus distance is a bit short – here’s the 50-80 f/1.2 with a more reasonable ~22mm back focus distance.

50-80mm f1.2


Expect this as a “Because we can” lens…

7th Two lenses for next month [Nok]

“RF24-70mm f / 2.8 L IS USM”, “RF15-35mm f / 2.8 L IS USM”, and “Lens Hood EW-88E”

4th A Japanese Canon lens patent application [HL]


It’s full frame but might not be EF or RF (cine of some sort)  As ever, remember that patents are not products…

Focal length: 12.40-18.00-23.64 mm
F No .: 4.35-4.96-5.60
Image height: 21.64 mm
Lens length: 142.18-132.82-131.14 mm
Back focus: 36.14-44.23-52.29 mm

2nd Suggestions [CR] that a 35/1.2 may be added to the RF lineup next year – this may come from some patent info but not one I’ve seen (I only check US stuff)

1st As a regular user of Canon TS-E tilt/shift lenses, my week testing the Hasselblad has been very interesting. Amongst other things it’s reminded me that I have an M645->EF tilt adapter and M645 35mm lens that I ought to put in my bag more often ;-)

I’ve now written up a short review of the H6D+HTS. It really is a pleasure to use – I just need a few more discerning clients looking for this level of imaging…


24th This is the sort of info I want to see on the back of my pro level EOS R camera, with next generation TS-E lenses…

tilt-indicator on H6D

19th One of my minor complaints about Canon TS-E lenses is that you get no electronic data from the camera about tilt/shift/rotation.

Not so with the Hasselblad HTS T/S adapter (and 1,5x TC) which gives live feedback to settings – tilt in 0.2º steps for example.

Well – I’ve got one to test for a bit with an H6D-50 and 28mm lens… [Thanks to Hasselblad UK]

HTS and H6D-50

The RF mount Laowa 15mm f/2 has turned up to have a look at. I’m hoping to have a review in a few weeks…


I’m testing it on the EOS RP, which I know works well with manual focus lenses.


The RF mount lens has no electronics, so you need to enable photos to be taken without a lens attached (see my EOS RP review for more)


Note the click/no click option for the aperture ring, For video fans I assume…

11th Sigma have announced new L mount lenses and even produced a roadmap for upcoming releases.

At some point, these should appear in RF mount…


10th Some photos of the upcoming sigma lenses appear [Nok] These should eventually appear in RF mount versions

sigma 45/2.8sigma 14-24 f/2.8sigma 35/1.2

9th The 24-240 is announced (but not available until September) – full details

5th A look at the RF24-240. Note how the control ring can be used as either a focus ring or a control ring.


4th The upcoming RF24-240 F4-6.3 IS USM is to have a price of ~$900, and with the RP as a kit at ~$2200

3rd Some suggestions that Sigma has ‘cracked’ the RF mount and is looking to bring out RF version of several lenses due for the ‘L’ mount (such as on the Panasonic S1R I recently reviewed)

Suggestions include:

  • 35mm f/1.2
  • 45mm f/2.8
  • 12-24mm f/2.8
  • 24-70mm f/2.8

1st To the ‘What RF lens next’ sweepstakes, we get an RF16-28 F2L model [CR] – presumable to give an f/2 set of lenses to go with the normal f/2.8 set (with and without IS of course).

We can be sure that Canon wants to be able to offer an enticing set of RF lenses to go with their upcoming ‘pro’ RF bodies, but that’s about all at the moment.


27th Motorised tilt and focus adjustment for a tilt lens is discussed in a new US patent application [USPTO]


Part of the patent shows example flowcharts for operation and includes the camera working out a ‘subject surface’ and seeing if it can match the plane of focus to the surface. Focusing tilted lenses accurately can be a nontrivial task (focusing with tilt), if you’re looking for precision placement of the focal plane.

The design could help with this, and I note it also goes into some detail concerning measurement of lens setting. Maybe we’ll finally see tilt and shift info recorded in EXIF.

Time for a super smart RF mount TS-E lens for the 21st century? ;-)

26th An RF300mm F2.8L IS USM lens is forecast for 2020 [CR]

25th A possible launch date for the 24-240 is the 9th of July (2 weeks time)

Hartblei have a new tilt/shift mount/adapter for medium format lenses on mirrorless bodies

21st It seems an RF kit lens is on the way with the following appearing in listings [Nok]:

RF24-240mm F4-6.3 IS USM, Lens Hood EW-78F, EOS RP 24-240mm kit

RF 24-240

A Canon Japan patent application [CN] shows a design for a switchable 1.4/2x teleconverter


20th A Japanese patent application [HL] shows designs for RF mount 600/4, 500/4 and 400/2.8 lenses


18th You may have seen stuff about Fuji’s recent ‘value angle’ data for lens mounts.

Yes, it’s a number, yes it tells you something about different mounts and sensors.

That’s about it for relevance.

I’d say it achieved its marketing value…
…as a new angle from Fuji to get people thinking about them.

Then there is this video from Canon about the RF mount, which Canon needs us to buy into (the music is the clue). Note that if you know much about optics, it won’t just be the music that grates ;-)

This too has achieved one of its desired effects of creating more FUD and pointless bickering on forums…

As for DxOMark ratings for lenses, I can’t cover it better than Thom Hogan does [TH]

If you’ve ever read any of my reviews and wondered why I don’t compare models or make recommendations, or give spurious ‘scores’ then have a look at Why I never recommend the best products

6th All my Canon lenses work well on the Panasonic S1R with the Sigma MC-21 adapter – what works particularly well are my TS-E lenses in 187MP multishot mode.  See my lengthy Panasonic S1R review for more…

A US patent application [USPTN] shows roller bearings in the tripod mounting bracket for a long lens.


3rd There’s an interview with the designers of the new RF85/1.2 at Canon Europe

RF 85mm f1.2


30th More short backfocus (RF mount) long lens designs in a Canon USPTO filing

Designs include 400/2.8, 500/4 and 600/4

400 f/2.8

Curious about the latest ultrasonic motors in Canon lenses? A Canon USPTO filing may help…

ultrasonic motor design

A Canon lens patent application for a 55-200 f/4.5-6.5 zoom at the USPTO.

APS-C and a longish backfocus means  that it could even be EF-S or EF-M


25th A Canon telephoto patent application [USPTO] covers 400/2.8 | 500/4 | 600/4

rf 400-28

Nothing unusual there, until you notice the 33mm back focus distance – these are RF lens designs.

Expect these to appear when there are sufficiently expensive ‘pro’ EOS R camera to go with them ;-)

21st Yes, we’re all expecting new Canon RF mount lenses, but when and what?  A 24/1.4L and 135/1.8L are added to the list for next year’s CP+ [CR] along with a dedicated macro of some sort – time perhaps for a specialist lens to replace the MP-E65?

More likely a ‘normal’ macro of some sort (the MP-E65 works just fine on my 5Ds and EOS RP)

18th A US patent application [USPTO] includes three RF prime lens designs. Note that whilst IS is not shown in the diagram below, it is specifically mentioned as an option for the lenses.

85/1.2 | 100/1.4 | 135/1.8 (below)

RF135 f1.8

Canon wants to bulk out its RF lens options pretty quickly – a good 135/1.8 would be well received.

Now for one a bit different…

When you tilt a lens to move the plane of focus, there are shifts to the image introduced through the tilting. This particular patent application [USPTO] looks at adding two internal shift modules into the lens to compensate for this.

This example (50mm f/4) shows the two shiftable units.

50mm ts lens

but wait there’s more…  How about a zoom T/S lens? This example is for a 24-70/4


There are designs shown for a 24-100/4 and 30-80/4 too.

What to make of this? The designs are likely just to patent certain design features such as the multiple shift elements and the calculations and control methods involved. Note that the patent includes a lot of optical design info and discusses the calculations needed for offsetting the moveable elements.

Given that the recent (superb) TS-E lenses don’t even record tilt and shift in EXIF data, I don’t think these are feature that we’re going to see in any upcoming T/S lenses for the RF mount.  A zoom TS-E lens would be a phenomenally complex thing to design with sufficient image quality … I dread to think of the price ;-)

Having just tried the TS-E17 and 24 mk2 on the Panasonic S1R in it’s ~187MP mode, I think both of them are likely to appear in RF mount, with improved resolution, ready to get the most from a high MP EOS R body. Both are good, but using the new TS-E50/90/135 lenses shows just how they could be better…

16th A Japanese patent application [HL] shows a 17-34 f4-5.6 design for RF


12th An interesting article from Canon about the differences between the two different versions of the RF85/1.2. Note that the DS is not a ‘soft focus’ lens. Note that the DS softening works best at wider apertures and can lose up to 1.5 stops of light transmission.

7th For more about the new Laowa lens, see my detailed Laowa 100mm macro review

6th There is a new Laowa 100mm f/2.8 2x macro lens from Venus Optics – rather a nice lens.

I’ll have a detailed review very shortly…

100mm lens-and-box3rd The RF 85/1.2L should be announced next week, and it’s expected that the ‘standard set’ of zooms should appear July/August

  • RF 15-35mm f/2.8L
  • RF 24-70mm f/2.8L IS
  • RF 70-200mm f/2.8L IS

These have been ‘expected’ for a while – no sign of any ‘affordable’ RF lenses as yet


30th In a story obviously saved up for a few months for a slow news day, there’s an interview [IR] with Sigma (at CP+) talking a about various lens issues. It’s good to see plans for L mount lenses, although they note that whilst native Z and RF lenses are on their way, they are looking at adapter performance as well for existing lenses.  There is mention of APS-C lenses for L mount (for example, the Leica TL and CL have L mount and APS-C sensors).

As an aside, the MC-21 Mount Converter works very well on the S1R. I’ve been having a look at the multishot ~187MP mode with the Canon TS-E24.


A 100% crop showing the level of detail (f/8 with slight upwards shift)


There are two multishot modes, one allows for a bit more movement (using just one of the shots taken) whilst the other uses all shots for everything. Click the two images above to enlarge – these were using ‘mode 1’ the full multishot, so note the movement of people.

I’ll have a few more examples when I write up some review notes.

For my architectural work the S1R could be an excellent replacement for my 5Ds – the high res viewfinder makes manual focus just so easy, and after a few days shooting, I’m getting to grips with the menus and customisation options. Oh and 187MP shows up minor deficiencies in the TS-E24 and TS-E17 enough that I’d expect to see updated versions to go with any true high res ‘Pro’ EOS R.

27th The RF 85/1.2L and lens hood ET-89 are listed in some Canon product lists – time to start chatting with your dealer if you want one… [TwT via Nok]

26th I’ve been having a quick look at the Panasonic S1R with the very nice Panasonic ‘L’ lenses, but have just got the Sigma MC21 EF lens adapter, so will be able to see how it works with the likes of my TS-E24 in ~190MP multishot mode.


The RF mount needs a few more lenses at all levels to push the mirrorless plans at Canon, so it’s good to hear a suggestion of up to 8 new RF lenses for next year [CR] – we can but wonder what appears in the ‘Because we can’ category…

There’s a stack of Canon lens designs appearing in Japanese patent applications (it’s the US ones I check – sometimes they are ahead of Japan, sometimes behind) – there are quite a few listed at [CN]

25th Those exotic glasses in modern lenses aren’t found by chance. If you’ve a bit of chemistry knowledge, then a Canon patent application [USPTO] looks at glass mixtures (including Lanthanum and Niobium), and mentions a means of containerless solidification.

glass cooling

A sintered block of the glass source materials (1) is heated by a CO2 laser (5) to melt it. The blob of glass (2) is levitated in a stream of gas (4). Turning off the laser cools the glass which can then be taken to a mould to make some of the fancy lens elements we see.

18th A US patent application [USPTO] discusses aspects of DO element design for lenses. Interestingly, there is an example in the document showing a 200mm f/2 DO lens (and an 800/5.6)

200mm f2 DO

11th Some lens and RF mount info in an interview… this time EOS Magazine

AA: EF lenses have eight contacts on the lens mount, while RF lenses have 12. What sort of additional features does this offer?

MB: The whole communication system in the RF mount has been designed with future potential as one of its core requirements.
When we introduced the EF mount there were so many things we weren’t aware of; IS was still a dream; we didn’t even know what digital was. When we were designing the RF mount, the future is also unknown, so we needed to plan ahead.
Some of the contacts on the RF mount we’re not actually using today. They’re for future expansion. But there’s a higher-powered delivery system, so we can deliver more power to the lenses, which could mean a bigger motor for faster autofocus (AF), or a power zoom. All these things are being built into the interface from day one, to allow for expansion. What that expansion is we don’t know. We’ve still got to work out what the next 30 years hold for us. The important thing is to lay down a solid foundation so that we can adapt to future demands.
The mount size – 54mm – just happens to be the same size as the EF mount, but we did try other mount sizes. We built prototypes and tried lots of crazy things to see what would happen. But 54mm gave the best balance, allowing us to position the optics any way we want.
So then the question is, why a flange distance of 20mm? Slightly smaller would have given better possibilities optically, but that means the whole front panel becomes thinner. You have to make the camera thinner and smaller, therefore the front body has less strength, and because you have to use thinner metals, the screws that hold it in have to be thinner. All these things then affect durability and endurance. And if you want to hang a big lens off the front of it, you’ve got to have a solid front panel, with big screws that keep everything in place. So it’s that balance of endurance and durability versus optical performance.
We’ve got the EOS M, which has a flange distance of 18mm and a smaller mount – so we had an example of a smaller mount and a shallow body depth. We had this as a reference point and tried different lens designs to see what would happen. It was a bottleneck for the future. If we wanted to use very wide aperture lenses, etc., they weren’t going to be possible on that sort of mount.

AA: There are currently four RF lenses, with a further six recently announced, but let’s not forget that the EOS R-series cameras are compatible with Canon’s range of over 160 EF and EF-S lenses. Are there any differences in terms of performance when using EF and EF-S lenses on EOS R cameras?

MB: No. For the RF protocol there are different channels. One is for the lens to talk straight to the camera, so if you’re zooming, etc, they’re communicating. And then the mount adaptor has a different channel, so it doesn’t interfere with any signals. Once the camera detects an EF lens, it swaps its protocol from RF to EF. It’s actually using the same protocol as an EOS 5D Mark IV with the same lens.

So, it would seem that the EF->RF mount makes the camera seem like a 5D mk4 to lenses

10th Zeiss is expected to announce the Zeiss Otus 100/1.4 in EF mount soon [Nok]

  • Mount: ZE (for Canon EF), ZF.2 (for Nikon F)
  • Lens constitution: 11 groups 14 pieces
  • Minimum shooting distance: 1.0 m
  • APO Sonnar lens design
  • Maximum shooting magnification: 1: 8.6
  • Filter diameter: 86 mm
  • Maximum diameter: 100.7 mm
  • Focus ring diameter: 90.0 mm
  • Total length (including the lens cap): ZE: 152.3 mm ZF. 2: 150.1 mm
  • Total length (excluding the lens cap): ZE: 128.8 mm ZF. 2: 126.5 mm
  • Weight: ZE: 1405g ZF. 2: 1336g

Zeiss Otus 100mm f1.4

7th An interesting interview (from CP+) at [DPR] from Sigma mainly about lens development. In particular there are all the different design constraints from differing lens mounts and AF needs.

4th New prime lens designs in two US patent applications.

All are full frame with slightly shorter than EF back focus distances. However the retrofocus designs look more likely as cine lenses than RF primes.

First [USPTO] 20/1.4 | 18/1.3 | 14/1.8 | 22/1.2 | 24/1.2
Second [USPTO]  20/1.4 | 16/1.4 | 14/1.8 | 17/1.8 | 16/1.8 | 17/1.7 | 18/1.8


It’s interesting to see this just after Canon announcing their ‘Sumire’ range of PL mount cine lenses [DPR]

  • CN-E14mm T3.1 FP X
  • CN-E20mm T1.5 FP X
  • CN-E24mm T1.5 FP X
  • CN-E35mm T1.5 FP X
  • CN-E50mm T1.3 FP X
  • CN-E85mm T1.3 FP X
  • CN-E135mm T2.2 FP X


30th An interesting Nikon interview [IR] looks at lens and camera design advantages of the Z mount.

29th A Japanese patent application is mentioned [HL] for an 85/1.2 and 100/1.4 – both definitely RF designs

This seems to be the Japanese version of the US application [USPTO] mentioned here a while ago.

28th A RF version of the EF8-15mm F4 fisheye zoom appears in a Canon patent application [USPTO]


A set of designs for long IS lenses appears in a new Canon patent application [USPTO]. Back focus distances are all enough for EF or RF designs.


Examples included in application: 300/2.8 | 400/2.8 | 500/4 | 600/4 800/5.6

Two new RF mount manual focus lenses from Samyang/Rokinon

26th A full set of Canon prime lens measured MTF charts have been published by Lens Rentals [LR]
These are actual averaged sets of data for good numbers of sample lenses (I look forward to seeing the TS-E lenses later).

However – what do these actually tell you? Firstly they are all at maximum aperture, so you don’t get to compare models at the same aperture. The article contains a link to a much more comprehensive discussion about what MTF is [LR] that should be required reading for anyone thinking of contributing to a forum thread about ‘sharpness’. See also some of my thoughts on why expensive 3rd party primes are sometimes just for people buying super expensive loudspeaker cables ;-)

22nd In one of those things I noticed when using wider lenses at wide apertures on the EOS RP(EF50/1.4 and Zuiko 50/1.2), is the return of ‘proper DOF’ in the viewfinder.  With exposure adjustment (Av mode for the 50/1.2 and auto ISO) you can get a very good feel for the real DOF that you’re going to get. This not only encourages more thought about the areas in focus, but also how the OOF background looks. I had special focus screens on the 1Ds/1Ds3 and missed this on the 5Ds.
More in my EOS RP usage notes

Several Japanese lens patent applications appear [HL]

These look to be the same as USPTO filings listed below, back in February

35/1.4 and 85/1.2  JP 2019-45631 (P2019-45631A)

35mm 1.4 RFRF 85mm f1.2

There’s also an RF version of the 70-200 2.8

  • Zoom ratio: 2.71
  • Focal length: 72.00 ~ 134.99 ~ 194.94 mm
  • F number: 2.91 to 2.91 to 2.98
  • Angle of view: 16.73 to 9.11 to 6.33
  • Image height: 21.64 mm
  • Lens length: 172.73 to 219.96 to 231.71 mm
  • Back focus: 14.37 to 18.40 to 28.12 mm

RF 70-200 f/2.8

The lens design shown in article at HL is one of the designs in the US version [USPTO]

19th Canon will be updating firmware for the  EF 400mm F2.8L IS III USM and EF 600 mm F4L IS III USM. It’s to correct uneven video exposure [CR]

A firmware update for the RF35/1.8

“Support for the “panning” scene mode with the EOS RP has been added. The ”panning” scene mode reduces subject blurring and blurs the background when the lens is mounted to the EOS RP.”

Firmware for the RF 24-105mm F/4L IS USM (Firmware Version 2.0.0)

“Supports continuous shooting in silent shooting mode with the EOS R running Firmware Version 1.1.0 or later.”

15th Sigma have updated firmware for a lot of EF lenses [Sigma]

This firmware allows compatibility with Canon’s in-camera Lens Aberration Correction function to enable correction matching the optical characteristics of each lens. It also corrects the phenomenon that abnormal images appear or operation errors occur when the function is enabled. In addition, it improves the functionality. Furthermore, there is an improvement to the phenomena particular to some lenses when they are used in combination with the Canon “EOS R” and their “Mount Adapter EF-EOS R”, or “Control Ring Mount Adapter EF-EOS R”.

Compatibility is a big issue at the moment for third party adapters and lenses. I’ve had to remove the AF confirm chips from my M42 and OM adapters since they locked up my EOS RP.  I’m testing a brand new 2x macro lens at the moment, but it works just fine on my 5Ds.

14th A Canon Japanese patent application [HL] shows a 10mm f/2.8 design

10mm F2.8

The back focus means this could (just) be an EF design. An RF only design might well be shorter and a bit more symmetrical (front/back)

  • Focal length: 10.30 mm
  • F number: 2.88
  • Half angle of view: 64.54
  • Image height: 21.64 mm
  • Lens length: 124.58 mm
  • Back focus: 38.00 mm

A Canon patent for several RF (full frame) zoom designs [USPTO] such as this 24-70 f/2.8 IS

zoom_24-70 F2.8


There are several 24-70 f/2.8 designs and a 28-85 f/2-2.8

There are several wide prime designs in another patent application [USPTO], such as this 85/1.2

rf85 f/1.2

Also a 100/1.4 – once again all RF full frame.

12th You may have noticed a bit of  ‘my mount goes wider than yours’ comparison in some parts…

Well, obviously different mount designs let you develop lenses with different maximum apertures, and some at Sony seem peeved by comments that the Sony E mount wasn’t designed for mirrorless full frame [PR].

Suffice to say, all the people showing any real concern over this seem to be men… ;-)

This slide [NR] appeared at a Sony presentation, showing how low the F number could go for mounts.

aperture mounts

So, the E mount ‘could’ do f/0.63

These figures are from a Sony presentation, so I’ve no proof of this or what design constraints and caveats there are behind those numbers.

Looking at the E mount, it’s apparent that you ‘can’ do full frame – that is not to say it was designed ‘for’ full frame.

If you’ve ever used any really wide aperture lenses you’ll quickly realise that their uses are rather more limited than you first thought. That said, I’m finding my old Olympus Zuiko 50mm f/1.2 really nice to use on the EOS RP

5th An excellent round up of all the ‘little things’ like adapters, shown at CP+ [DCW via Goog XLT]

A lot of people are doing adapters…

The article includes a note that the Laowa 15 mm F 2 Zero-D and Laowa 10-18 mm F 4.5-5.6 Zoom are coming to Z and RF mounts.


There’s a big rush to get lenses out that go with the RF mount, and Canon have suggested several.

There are also the more extreme, such as RF14-21 F1.4 [CR] – partly based on some patent application stuff we’ve seen here (RF 16-35mm f/2.8L and an RF 12-20mm f/2L).

3rd Whilst I’ll be writing more detailed articles using the EOS RP, I’ve a Using the EOS RP notes page where I’m jotting down thoughts about using it, from the point of a long time full frame Canon DSLR user. Mostly good and I’ve only a few gripes at the moment – a particular annoyance being that it turns on lens IS for as long as the viewfinder is active, rather than starting it as you half press the shutter. This is a pain with bigger lenses, not only does it waste the (tiny) battery power, it means that IS is on for a while when I’m just carrying the camera.
Please Canon, a C.Fn function to only turn on IS when you want it?

1st Our RP has turned up and I tried a few old lenses on it with adapters – a quick note that if your adapters have ‘AF chips’ on them, they may lock up the camera. Other than that, I’m pleased to see how useful my old glass will be.

rp and Zuiko 50mm f/1.2


28th I’ve been trying some new camera shake removal software from Topaz, not at all bad, and it has a free demo versio.

Topaz Sharpen AI

Will the next Tilt Shift lenses from Canon finally incorporate tilt/shift settings in camera data?

A new patent application [USPTO] discusses image aberration correction when the lens is tilted/shifted.


At last – lens movement data in the EXIF?

I note the zoom control in the diagram above. Whilst it could be for completeness, I’m dreading the price of a zoom TS-E lens at the sort of image quality we’ve seen in the most recent T/S lenses ;-)

Some short backfocus full frame (i.e. RF) designs appear in a new patent application [USPTO]

70-200 f2.8-3.4 | 70-200 f2.8 100-200 f/4

Note how much more symmetrical this  design is and how it has internal elements that do not move relative to the lens when zooming and focusing.  Some non-‘L’ RF zooms?


A patent application [USPTO] looks at control of out of focus areas using lens elements which fade off in transmission towards the edges for apodisation reasons (see examples from 16th below)


Full frame examples in the patent include:

35/1.4 | 85/1.2 | 28/2.8

Could this be the RF 85/1.2L USM DS recently mentioned?

23rd The ‘perhaps not as useful as you might have first thought’ SPEEDMASTER 50mm f/0.95 III lens for Sony E / Canon RF / Nikon Z mounts will be announced shortly. [CR]

21st Some new DO lens designs appear in Japanese patent info [HL]

400/4, 600/4 and 800/5.6 designs a bit different from previous ones. Remember that patents only usually show some aspects of designs rather than complete products.

DO-lens 600/4

20th Tamron announce three new lenses SP 35mm F1.4, 35-150mm F2.8-4 and E-mount 17-28mm F2.8 III. All three are full frame, however it’s worth noting that the first two are Canon EF and Nikon F mount, whilst the mirrorless one is Sony E mount only.  I suspect we’ll see version for Z and RF mount before too long.

As yet though, we don’t know how difficult Canon and Nikon have made it for third party lens makers…

17th Whilst not mentioned in the recent lens list, a RF50/1.8 and RF24/1.4L are suggested as possible additional lenses [CR] – both seem pretty obvious additions to expand the range at some point.

16th There appears to be renewed interest in apodisation[WP], with respect to the RF 85/1.2L USM DS recently pre-announced. This is something Canon have worked on a lot.

In the recent Canon interview at IR they say

DE: Is this something like an apodization lens? Can you share any more detail about what the lens is like internally?

Canon: Yes. It uses basically the same technology as apodization. There are several manufacturers that have apodization lenses, but our approach to apodization is slightly different. What we do is we use coating technology to make the apodization.

A recent patent application [USPTO] shows how variations in coatings can give light transmission that varies across the element.


A look back to March 2018 shows several examples that may give clues in a whole range of Canon fast prime lens designs (24/1.4 shown below) in a US patent application [USPTO]

Designs include 50/1.4 | 35/1.4 | 24/1.4 | 85/1.2  This example is the 85/1.2


In this example elements 41 and 42 give a transmission that falls off towards the edges as shown in this graph


This particular patent looks at control of apodisation as focus is changed. Note that these are not short back focus RF type designs, so any optical layout is likely to be more symmetrical, with larger rear elements. I’d also suspect we would see the front apo filter moved inside the lens, maybe as a coating to a lens element (as at ’42’ above)

This is the 24/1.4 with apo elements ’31’ and ’32’.

apo-24 1.4

Another patent application looked at graduated filter elements [USPTO]

grad filter

More about this from 2017 [USPTO]

14th Nikon announce the Nikon Z 24-70mm F2.8 S [Information page]

Canon produce a lens roadmap – first I’ve ever seen


Here’s the accompanying press release.

Canon commits to future of its RF Mount with development of six new lenses for the EOS R System

United Kingdom, Republic of Ireland, 14 February 2019 – Canon, the world leader in lens manufacturing, today reaffirms its commitment to its recently launched EOS R System and RF Mount, announcing the development of six full frame lenses for release in 2019 in celebration of reaching a production milestone of 140 million EF and RF lenses[i]. Redefining the possibilities of photography and videography, Canon?s innovative EOS R System and existing RF portfolio of lenses provides the tools for users to enhance their skills and shoot creatively, without limitations.

The RF Mount – built from the ground up

Built from the ground up, the EOS R System and RF Mount takes the heritage of the existing EOS System to new heights. Developed in line with technological advancements and end user feedback, Canon’s development of EOS anticipates the future technical and creative needs of photographers and videographers. The EOS R System incorporates the best of EOS, with even greater levels of performance, lens design possibilities and creative flexibility. Launched in September 2018, the RF lens mount enables a radical new optical design, allowing large lens elements to be placed as near to the sensor as possible, allowing light to hit the sensor straight on. The RF Mount enhances communication and power transmission between the lens and camera body, as well as helping to achieve the world’s fastest autofocus speed for a full frame mirrorless camera system[ii]. The mount’s short back focus and wide 54mm mount diameter has made it possible for Canon optical engineers to have a new degree of freedom in order to create a new generation of optics – it provides an ideal balance between reducing the size of the system, high-quality images and high-spec performance. When developing the EOS R System, Canon’s engineers considered the ease of handling and potential to expand the lens portfolio in the future. This new line-up of lenses provides shooting options for all users of the EOS R System, whatever their requirements – from stills and movies, to landscapes or weddings.

Six lenses – shoot your own way

Six full frame RF lenses are currently in development, suiting the needs of every user from advanced amateurs, to professional photographers and videographers, all in pursuit of the perfect shot. Building on Canon?s optical lens heritage, this range of lenses will push forward the frontiers of creative capture thanks to the new, cutting-edge optics and advanced image processing for both stills and video.

The RF 85mm F1.2L USM is a large aperture mid-telephoto prime lens, offering the ultimate performance for advanced and professional portrait photographers. The RF 85mm F1.2L USM DS, with Defocus Smoothing, is a unique high-performance lens, offering a combination of beautifully smooth, defocused foreground and background bokeh and a super-fast aperture to produce breathtaking portraits. The RF 24-70mm F2.8L IS USM is a high-performance, standard zoom lens for professionals and photo enthusiasts alike – ideal for shooting portraits, landscapes, documentary or weddings. Offering a wide angle and fast aperture in a single package, the RF 15-35mm F2.8L IS USM is ideal for a range of genres including architecture, interiors or landscapes. The fifth lens currently in development, the RF 70-200mm F2.8L IS USM, is a must-have for any professional photographer shooting weddings, sport or wildlife. This lens is a great all-round, high-speed, medium telephoto zoom lens. Finally, the RF 24-240mm F4-6.3 IS USM is the perfect travel companion – practical in both size and performance. It is a versatile all-purpose lens for the advanced amateur photographer or videographer offering a range of focal lengths for capturing extraordinary shots.

Mr Issei Morimoto, Senior Vice President of Product Management and Marketing, Canon Europe, commented: “Last year, with the launch of the EOS R System we showcased the future of photography and videography. With that, Canon championed the core strengths of our EOS R System and RF Mount – innovation, compatibility and quality. As the production of our EF and RF lenses reaches a momentous milestone of 140 million, our new RF Mount opens a new world of creative opportunities for all photographers and videographers, whether they’re an existing EOS user, new to EOS R or stepping into the world of full frame. Today, with the announcement of our lens roadmap, we?re building on our lens heritage and firmly committing to the future, showcasing our investment in our pioneering full frame world. Delivering incredible image quality and optical excellence for our customers is paramount and this is just the first step on a long journey, ensuring every Canon user can achieve their perfect shot.”

Adding to the full frame family

Further expanding the EOS R System, Canon today also launches the EOS RP – ideal for those looking to take a step-up from Canon’s APS-C models into Canon’s full frame world. It is compact, lightweight and versatile. Ideal for travel, landscape and portrait photography and videography, the EOS RP opens up the full spectrum of benefits of the EOS R System – including the world’s fastest autofocus – and as Canon’s smallest, lightest[iii] full frame digital camera to date it provides the ultimate blend of practicality and ease of use, with impressive image quality. Promising greater potential, advanced amateur photographers and videographers can use the EOS RP to enhance their technical skills and explore their creativity. Additionally, three lens mount adapters allow more than 70 current EF and EF-S lenses to be used with the EOS RP and the innovative EOS R System, adding new functionality to existing optics, while maintaining the excellent levels of performance and functionality previously seen with EOS DSLRs.

For more information about the EOS R System and Canon?s commitment to the RF Mount, please visit .


13th The Nikon Z 24-70mm F2.8 S lens is due soon.

Z 24-70 F2.8 S

12th One of the RF lenses coming soon is the RF85mm F1.2L USM DS

It’s suggested [Nok] that the DS refers to a recent Canon trademark ‘Defocus smoothing’ [TM]

There may well be RF85mm F1.2L USM DS and a RF85mm F1.2L USM versions.

Well, you’re going to be using an 85/1.2 for soft backgrounds, so why not make up a new marketing term ;-)

11th Samyang are widely expected to be expanding their range of AF lenses for EF mount. At the moment they just have 14mm and 85mm with AF.

7th A Japanese Canon patent application [HL] appears for a 70-300 f4-5.6 in RF mount



I’d note that there is currently a (2016) Canon EF70-300mm f/4-5.6 IS II USM and a (2010) Canon EF70-300mm f/4-5.6L IS USM, not to forget the (2004) Canon EF70-300mm f/4.5-5.6 DO IS USM

Links are to lens data on

Canon continue to address performance issues for diffractive elements for lenses, and their manufacture in a new patent application [USPTO]. The DO element includes resin layers of differing optical characteristics.


Lens designs for long telephoto in a patent application [USPTO]

300/2.8  400/2.8 600/4 800/5.6 – all with internal filter option [G]


A second patent application has some slightly different designs [USPTO] – here’s the 800mm


Al designs full frame and with enough back focus distance for RF or EF mount

4th 2018 patents, info and rumours moved to the 2018 lens archive page

A rush of RF lenses due in a week or two [Nok]

4 ‘L’ lenses in the 5 listed (there may be some others too)

RF 70-200 mm F 2.8 L IS USM

RF 70-200 mm F 2.8 L IS USM

RF 15 - 35 mm F 2.8 L IS USM

RF 15 – 35 mm F 2.8 L IS USM

RF 24 - 240 mm F 4 - 6. 3 IS USM

RF 24 – 240 mm F 4 – 6. 3 IS USM

RF 24 - 70 mm F 2.8 L IS USM

RF 24 – 70 mm F 2.8 L IS USM

RF 85 mm F 1.2 L USM

RF 85 mm F 1.2 L USM

Canon knows which lenses are ‘needed’ to give the RF mount some depth. Expect some more basic kit lenses too, since I doubt Canon expect everyone to go for an ‘L’ lens collection…

1st For fans of the lens/body communications protocols of the new RF mount, 2 US patent applications discusses high speed data transfers [USPTO#2]

Some more examples of ‘extreme optics’ appear in two patent applications from Canon [USPTO, #2]


Primarily intended for automotive use, they are asymmetrical, so the field of view (and F number) differs for side to side FOV and vertical FOV

catadioptric optics


29th Canon has published a lengthy Developers’ Interview for the EF 400mm f/2.8L IS III USM & EF 600mm f/4L IS III USM Lenses [PDF, 19.6 MB].

24th A Canon US patent application [USPTO] looks at zoom lens designs using exotic glass. Short back focus, so RF full frame.

rf zoom

Examples include 70-300 f/4-5.6 | 100-400 f/4-5.6 | 50-240 f/4-5.6

Fairly simple zooms – these could be the basis of some non-‘L’ designs for the EOS R system

18th patent 500 - 600 DOCanon show some more DO lens designs in a Japanese patent application [CN]

If you look back on this page (and the archives from previous years) you’ll see lots of DO related patent info.

Diffractive optics designs still suffer from light leakage, and quite a lot of work has gone into reducing this.

Where a normal lens bends all the light that isn’t reflected off surfaces, DO elements can ‘leak’ undiffracted (‘zeroth order’) light through, reducing contrast and producing some of the halo effects associated with early DO lenses.

When we do see new DO designs launched, expect them to be rather good…

17th Sigma have updated their compatibility info for their lenses with the EOS-R.

All work functionally, but some in-camera lens fixes have issues. There are still potential lock-up issues with these three – firmware updates are expected

  • SIGMA 24-70mm F2.8 DG OS HSM | Art
    ・It may require the battery to be taken out once, if restarting the camera does not work when the lens is taken off the camera while the lens’s OS function is in operation.
    ・It may stop the focus driving from infinity to closer focus distance while shooting video with AF.
  • SIGMA 60-600mm F4.5-6.3 DG OS HSM | Sports
    ・It may require the battery to be taken out once, if restarting the camera does not work when the lens is taken off the camera while the lens’s OS function is in operation.
  • SIGMA 100-400mm F5-6.3 DG OS HSM | Contemporary
    ・It may require the battery to be taken out once, if restarting the camera does not work when the lens is taken off the camera while the lens’s OS function is in operation.
    ・It may stop the focus driving from infinity to closer focus distance while shooting video with AF.

11th Not lenses, but a new article I feel is important – Why printing will improve all of your photography

Some RF zoom lens designs appear in a Canon US patent application [USPTO]

All full frame and short back focus. 28-70 f/2 and 24-70 f/2.8 are in the sample specs.

rf24-70 f/2.8

Possible RF 24-70 f/2.8 lens design – a lot of glass.

If you’re a fan of unusual optical designs, a Canon patent application [USPTO] is packed full of them

unusual optics

Intended for sensors and projectors.

Just one more ;-)


A Japanese lens patent application by Canon [via HL] shows various lens designs with additional focal reducers.

Focal reducers reduce a lens focal length and increase maximum aperture (the opposite of a normal teleconverter)

Canon hasn’t produced any such products in the past, but perhaps there is a desire to allow EF lenses to perform as they would on a full frame sensor, on an EF-M mount (or crop sensor EOS R)

focal reducer

A Japanese patent application [CN] shows a number of wide zooms that fit the Super35 format (~APS-H) and are EF mount. Almost certainly for video use

cine zoom

5th A new basic EF->RF adapter is available from Commlite.  It’s a metal one with detachable foot and supports full lens/body communications.

ef-rf adapter rearef-rf adapter front


3rd A few lens patent applications at the USPTO for Canon…

What look to be RF designs (full frame short back focus)

24-80/4, 24-100/4 and 24-130/4 (with IS) [USPTO]

Canon RF zoom

A second patent [USPTO] has longer zooms

70-200/2.8 – note how far forward the IS is

rf 70-200 2.8 IS

Also included are several design variants such as a 100-200 f/4

APS-C isn’t forgotten with some smaller zooms [USPTO] where the designs concentrate on the rear elements and achieving good telecentricity.

Examples include: 15-50 f3.5-6 | 20-130 f3.5-6 | 18-200 f3.8-6.5

Probably EF-M?

January 2nd 2019 We’re all expecting Canon to make a serious expansion effort for the EOS-R range and RF lenses this year.

In terms of lenses, there is this suggested announcement list at [CR]

  • RF 16-35mm f/2.8L (or similar)
  • RF 24-70mm f/2.8L IS (or similar)
  • RF 70-200mm f/2.8L IS (or similar)
  • RF 105mm f/1.4L
  • RF 85mm f/1.8 IS STM
  • RF Macro lens
  • RF non-L kit lens

The availability of lenses will show where Canon is pushing EOS R adoption – I’d simply note that it will be based on Canon’s business projections and not any whinging on forums ;-)

It’s interesting to see it suggested that Canon is going to release at least 15 new lenses within the next 2-3 years

2018 news/patents/articles moved to their own 2018 Lens archive page

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