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This lens is Canon’s offering in the ultra wide zoom category for cropped sensor digital SLR cameras. As the only contender to exceed the 2:1 zoom ratio to date, we take a look at how it performs.

Specifications

• Focal length 10-22mm
• Aperture f/3.5-4.5
• Angle of view n/a
• Filter size / type 77mm
• Construction Elements/groups 13 elements in 10 groups
• Focusing type Internal USM
• Closest focus 0.24m
• Weight 0.385kg
• Dimensions (Dia x length) 83.5x89.8mm
• Mounts available Canon EF-S (Only fits 20D, 350D & 300D)
• Tripod bush No
• Price £599.99

Build and handling
The lens is a well-built example that feels sensibly weighted, not being too plasticy but not too heavy either. The mount is slightly different to the standard Canon mount and is denoted by the absence of the usual red dot for location. This is replaced by a raised white spot that locates with a similar spot on the appropriate cameras, just to the left of the standard location dot. The S in EF-S stands for ‘short back focus’ and means the lens cannot be used on any of the older cropped sensor cameras such as the D30/60 or the 10D, as the rear element protrudes into the camera body and would hit the mirrors on these models. Do not try to fit it to the 1D/5D series either, as the same problem occurs!

The left side of the barrel carries the normal AF/MF switch and there is a distance window just forward of this. Marked in metres and feet, it gives an idea of the focus distance set. A narrow manual focus ring is fairly well torqued although slightly light in use. In autofocus mode, the ring does not turn but will over-ride the AF if required. As with most of Canon’s USM offerings, it was quick and almost silent in operation although with such a wide angle to cope with, an occasional jitter is encountered as it locks on.

Next up is the broader zoom ring, marked at 10, 12, 14, 17, 20 and 22mm. Again, lightly torqued, it worked well and required less than a quarter turn to move through the whole range. The lens then widens a few millimetres before arriving at the front element and the 77mm filter thread. Disappointingly, the lens hood is an optional extra on this model, but would need removing to fit a filter system anyway. Filter systems, as with all of these ultra-wide angle lenses, needs to be of the 100mm or more types. The Cokin Z-Pro holder did not vignette when fitted.

Optical Performance
As a new lens designed from the ground upwards for cropped digital sensors, our expectations were fairly high and we were not disappointed. Most of the nasties that you could expect are well controlled and, with the exception of a slight pincushion at the 22mm end of the range, the distortions are well controlled too. Colour rendition was good, being slightly less warm than older Canon designed lenses and the contrast was more than acceptable.

Files, viewed at in excess of 100%, showed no evidence of fringing and test shots showed measurements for CA that are well within acceptable limits. Despite using the lens in some difficult lighting conditions we found no incidences of reflections inside the lens causing unwanted flare. Overall the performance was very good.

	At 17mm, 18mm and 20mm, respectively, these three pictures of Bodiam Castle and the Kent and East Sussex Railway show that this can be a useful lens when carried on the camera. All three shots taken at f/10 with the Canon EOS 300D in aperture priority mode at ISO100.
Even when shooting almost directly into the sun there is no hint of lens flare, even without the optional hood. Canon EOS 300D with lens set to 10mm and a 1/2000sec at f/3.5 exposure on ISO100.	Once opened out to the full 10mm coverage the lens is capable of capturing the real drama of the scene. Canon EOS 300D at 1/125sec and f/16 with ISO100.

Click on each comparision photo below to view full size versions

10-22mm set at 10mm and f/8	10-22mm set at 22mm and f/8
10-22mm set at 10mm and f/3.5	10-22mm set at 22mm and f/4.5

Below is our lens test data. To find out how to use these graphs look at this article: How we test lenses

Verdict
The ultra-wide group to which this lens belongs has gone a long way towards overcoming the biggest drawback of cropped sensor dSLR’s, that of lost angle of view at the wide end. Being newly designed, it has addressed all of the other problems that have been thrown up by digital sensors and optically, if they had stopped at 20mm there would be very little to pick up on. The one slight disappointment is the build quality when looked at in terms of the price, as the cost is more than some ‘L’ class lenses and is the biggest barrier to owning this lens after the need to have one of the limited cameras it will fit on.

In summary, the positive points of the Canon EF-S 10-22mm f/3.5-4.5 USM are:
Good optical quality
Nice size and weight
No unexpected nasties.

The negative points are:
Price
Restricted fitting (Won’t fit D30/60 or 10D)
Lens hood is an optional extra.

Check the latest price for the Canon EF-S 10-22mm f/3.5-4.5 USM here

Test by Ian Andrews www.wildaboutkent.co.uk

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