Testing add-on tele and wide angle convertor lenses
Add on tele and wide angle convertor lenses
Assorted lenses added to the front of other lenses…
Part of our series of brief lens tests, using various lenses we found laying around the office…
Add on lenses were a popular adjunct for some cameras in the past (cine and still) where the standard lens was fixed (whether zoom or fixed focal length.
Keith has acquired several of these impressive looking bits of glass over the years, and decided to see if they were any good for anything more than seeing what would attach to what.
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Using old lenses
Sometimes it’s fun just trying to take some photos with the limitations of a particular lens – sometimes I’m just curious as to how much better modern lenses have become and need reminding why I spend so much on lenses for our business here at Northlight ;-)
Many older lenses can be fitted to your DSLR with a simple adapter. Canon users have a bonus here in that the distance from the mount to the sensor is relatively short, making for easier mechanical design of adapters, such as the Olympus OM mount to Canon EF mount adapter you can see on two of the lenses I’ve used here.
The bits of glass…
The 1.5x and 1.3x adapters at the back and right are called ‘Tele Converters’, and were originally for cine cameras.
The 1.4x TCON-14B and 0.8x WCON-08B were supplied with the Olympus E-20 digital camera. The smaller 0.8 converter came with an Olympus C-1400XL camera.
The left most lens shows the most obvious coatings, whilst the older Chinon and Sankyo lenses have fairly minimal coatings by today’s standards (modern lenses really are vastly better in this respect compared to those lenses from the 1980’s you find in junk shops.
Just one other thing you’ll likely need – a set of filter adapter rings
Ideally just one ring should cover what you need, since to avoid vignetting, the convertor should be as close to the front of your lens as possible. The rear lens element of the convertor ideally needs to be large enough to cover the field of view.
The 49-62mm step ring worked for the the Olympus convertors with the Zuiko 24mm f/2.8 and 50mm f1.2 lenses I tried.
One warning note here – lenses may not be designed to take much weight on the front, so be careful holding this setup. Indeed, I was going to try this with my Canon EF 50/1.4 lens, but there was so much movement I wasn’t happy going out with it, yet alone forcing the autofocus. Stick with manual focus to start with – I take no responsibility for you damaging the AF on a lens!
Attaching a lens
The back of the Chinon glass has a 58mm thread – I’m going to put adapters on it (mouse over image to see)
Then, the lens is attached (mouse over the image to see)
Adding the lens hood for good measure.
This gives this, when attached to my Canon 1Ds (The sample photos in the article are taken with my 1Ds mk3, but my old 1Ds is doing some modelling work)
And oh yes, this most definitely gets noticed when you go out with it :-)
This is ~65mm at f/1.2 at my local pastry and coffee shop…
There is minuscule depth of field, noticeable field curvature, massive chromatic aberration, blurring etc., etc.
More so with this view of a pollarded lime tree against the winter sky
A man in an orange car.
The lenses
Here’s some more of the set-ups I tried.
A longer tele converter. Note the revised focus scale (this device was for a movie camera)
A wide angle converter on the Zuiko 24mm (a good lens – see this look at the 24mm on the 1Ds3)
And the newer Olympus ‘Wide extension Lens pro’
The 1.4x converter on the TS-E90mm – so I’ve got a 126mm tilt/shift lens…
A very large shift lens – TS-E90+Chinon adapter (phone photo!)
There were other combinations, but I’m sure you get the idea…
A few sample images
Here’s a few more images from outside of my home that give a feel for what you’re likely to get with these lenses.
Using the rather wide f/1.2 setting is always going to be tricky
Note the differing magnification between the 1.3x and 1.5x lenses
If you mouse over the image below, you can see (even in this reduced size image) the effect of ‘fixing’ the chromatic aberration in Photoshop ACR (the settings are almost off the scale BTW)
Longer…
The longer TC worked fine on the TS-E 90mm, but with increased aberrations – enough that if I needed to tilt a lens at this focal length, I’d use a Canon 1.4x teleconverter between the TS-E90 and body.
Conclusions
Interesting effects, but hardly items to go in my camera bag on most jobs I work on.
I will admit that the Chinon converter on the Zuiko 50/1.2 makes for some interesting effects – something to file away ‘just in case’.
One side benefit of using lenses on the front of of others is that you don’t get the loss of light through an effective loss of one stop of aperture, of course you get distortion and lots of other effect, but that might not matter.
I’ve never been a fan of using bad cameras just for the sake of it – sure, I can find it fun to go out and take some shots with one of these lens combinations, and just see what turns up.
That’s fine but what am I going to do with such images – probably not a lot – and no, I’m not an instagram fan either.
I didn’t have one at hand, but I’d be interested to see how the converters perform on the standard ‘kit lenses’ you get on some DSLRs.
My suspicion is that with slower lenses, with smaller front elements, the distortions that I’ve highlighted would be much more under control.
Summary
Interesting experiment for altering the look you get from lenses – if you find one of these teleconverters in a junk shop somewhere, well worth the few quid they can go for.
Here’s the rest of my optical ‘junk’ drawer BTW
Just remember that (IMHO) it’s about actually taking photos not just the techy stuff!
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More experimental and How-to articles
All articles and reviews are listed on our main Articles and Reviews page, or use the search box at the top of any page. Experimental items, hacks and how-to articles are all listed in the Photo-hacks category Some specific articles that may be of interest:
- Using old lenses on your DSLR
- The 1Ds digital pinhole SLR camera A Canon 1Ds pinhole camera, making a 50mm 'standard' pinhole and a 200mm zoom version - results are compared to a lens some £1400 more expensive.
- Canon View Camera An adapter ($20) to use an old MPP 5x4 view camera with a Canon 1Ds. Article shows details of construction and just what it can be used for. Could be adapted for any DSLR and many old large format cameras.
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