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A 90 mm tilt and shift lens
The Canon TS-E 90mm lens
|24mm 3.5L||TS-E45mm f/2.8||TS-E90mm f/2.8|
I use the 24mm extensively for interior photography where the shift function allows for perspective correction, and often gives more usable coverage than my EF 16-35 2.8L lens at 16mm, after using Photoshop to correct geometry.
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Although I've experimented with the tilt, it's not a feature I regularly think to use on the 24mm.
After experimenting with a TS-E90 for some product photography I decided that with this lens it would probably be the tilt that's most useful -- here's why.
If you've tried relatively close-up photography, you'll know that accurate focusing and control of depth of field is essential. Of course you can stop down to get more DOF, and with the 90mm you can go to f/32.
There is one nasty surprise waiting for DSLR users not used to going to such small apertures - DUST.
Because of the geometry of the filter in front of all digital camera sensors, dust becomes more noticeable as aperture reduces. I'll show some examples later, but you can rest assured that whatever cleaning technology you are using, f/32 will show up dust.
There is also the 'diffraction limit' to resolution that comes in with smaller apertures - on my own 1Ds this only really shows as a slight softening of the image above about f/18. With other sensor designs (smaller pixels) it may be more apparent. Be very aware that this is a subject that generates a lot of heat and not much light on discussion forums - without going into the physics, just accept that the image will get a bit softer :-) However this softness may not be a problem - YMMV
For those of you wanting the figures, here is a more detailed listing of the lens specs
|Angle of view (horzntl, vertl, diagnl)||22°37', 15°11', 27° (without tilt or shift)|
|Lens construction (elements/groups)||6/5|
|No. of diaphragm blades||8|
|Min/max aperture||f/32 - f/2.8|
|Closest focusing distance (m)||0.5|
|Maximum magnification (x)||0.29|
|Filter diameter (mm)||58|
|Max. diameter x length (mm)||73.6 x 88|
|Magnification with Extension Tube EF12||0.43 - 0.14|
|Magnification with Extension Tube EF25||0.60 - 0.31|
As part of my professional work I do product photography, often fairly small items. It's not the main part of my commercial work but it's one of those areas where having decent equipment certainly helps.
My desire to check out the TS-E90 came about after photographing some iridescent plastic bottles where a combination of reflective silver labels and a tricky lighting set-up was giving me some difficulties in getting the images I wanted (unfortunately they fall into the client confidential category, so I can't show the results as examples)
Using the TS-E90
From my work with the 24mm T/S lens I was aware that I could potentially solve some problems with a bit of tilt, but 24mm was far too short a focal length.
Here is an example that shows the benefit of tilt. It's shot at f/2.8 to get a shallow depth of field, but as you can see, not much of the front of the lens is in focus.
If you mouse over the image you can see the effect of 5 degrees of tilt. There is a slight shift in composition which I've allowed for, but shows up as a slight change in the gradation of the background.
One thing I noted was that the image shifts as you tilt. You could allow for this by shifting the lens, but the tilt and shift planes are at right angles. There is a simple modification to the lens to align these two planes. Some people suggest doing this as soon as you get the lens - I'm going to wait until I've used it a bit more. So far I have not done it on my 24mm, but that lens gets used for completely different work (at the moment).
- Note - May 2007 - I've modified the 90mm tilt and shift axis - see the note on shift lens modification for more info
I thought about other ways to show how tilting the plane of focus works with aperture, but in the end some simple examples of a row of coins should illustrate the point.
Here is the setup, showing one of the lighting tables I use for small product work (it has lights under the translucent plastic as well). Note that I'm using the angle finder on the 1Ds for accurate focusing. The lens is tilted about 6 degrees (adjusted by eye rather than calculated)
In fact, the whole subject of focussing when using tilt is rather complicated. There is no real substitute for lots of experimentation. I wrote a basic guide to using tilt which covers focusing.
If you use extension tubes for macro work then it can get very difficult to work out and I've used an iterative approach such as at the EOS documentation project
The photo below was taken at f/8. If you mouse over the image it shows the effect of tilting the lens
Here is a 100% crop to give an idea of the image quality (lens tilted). The inset shows the full frame.
Given the difficulty (I'd say futility) of making realistic comparisons between images on the web (JPEG compression, colour management etc.) I'm not going to post a whole load of 100% crops from different lenses. I'll just say that at f/8 to f/18 the images were sharper than any of my normal lenses (L zooms) and seemed to have better contrast as well.
Since I have only marginal interest in MTF figures and all that stuff ;-) I'm happy to say it's a damn fine lens.
For those of you who like to pore over lens test charts, I'll try and dig out a link for the resources bit at the end of the article ;-)
At f/32 and some tilt, this full frame shows an impressive depth of field
However a quick levels adjustment shows on this 100% crop, how much dust lives on the surface of even a fairly clean sensor
Dust - some of it was probably on the surface, but quite a bit is on the sensor. I live in the real world - dust just is...
Fortunately much of this stuff is invisible at f/11 and in many real world images, even at f/32
It's still less than I found on a negative I had to scan recently ... film - no thanks :-)
Here's one more example taken recently with an extension tube and a small amount of tilt. The flowers are ~5mm long
Superb bit of non 'L' glass from Canon. Excellent for product photography and where you want to play with depth of field.
The 90mm focal length and 50cm minimum focus distance gives a useful magnification of .29x (that means the image size on the sensor is 0.29 times its real size)
Higher magnification can be achieved by using extension tubes.
The Canon 12mm Extension tube allows magnification of .43x and the Canon 25mm Extension tube allows magnification of .6x
I took some examples of buildings using shift, but they just don't show up that much effect for images the size that are on this page
I'd welcome any comments or examples (I'll link to them) from users of the TS-E 90 if they have any shots that really show it at it's best...
Being quite a bit longer focal length than the 24mm, the depth of field effects are more noticeable, but as an artistic tool I'd advise anyone to go out and play with it, to get some of that 'new toy' feeling cleared up.
I've found that any new lens promotes a burst of 'creativity' that may or may not pass the test of time - generally, I'd rather do this in my own time than when working for a client :-)
Extreme tilt can have interesting effects, but interesting is not always best for a subject ;-)
Buying a TS-E lens
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It's also quite a nice lens for portrait work, although I have admit I prefer my 70-200 2.8L with its image stabilisation and excellent out of focus softness (bokeh) for hand held shots (I don't do studio portrait work or -anything- connected with weddings :-)
I'll add links to any TS-E90 photos I put on the site
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