Canon EF-S 10-22mm f/3.5-4.5 USM - Retest @ 15MP / Review - Analysis
Lens Reviews - Canon EOS (APS-C)

Distortion

The EF-S 10-22mm f/3.5-4.5 USM exhibited a quite impressive performance here and that's not only for an ultra-wide zoom but also in absolute terms - at 10mm there's only a slight barrel distortion (mustache style) which evens out at about 14mm followed by marginal pincushion distortion at 22mm.

Move the mouse cursor over the focal length text marks below to observe the respective distortion
10mm 14mm 22mm

The data has been taken from the old review because this characteristic cannot change when moving to a different sensor with the same physical size.

The chart above has a real-world size of about 120x80cm.

Vignetting

The EF-S 10-22mm is a native APS-C lens with a reduced image circle so it is not surprising that vignetting is a more pronounced than with full frame lenses. At max. aperture the vignetting peaks around +1.4EV which is usually quite easily visible in field conditions. You can reduce the problem to acceptable levels when stopping down to f/5.6.

MTF (resolution)

The lens produced a very good performance in the lab. The center resolution is excellent (just) throughout the zoom range although it's also quite obvious that it is no match for the 15mp sensor of the test camera anymore. The borders and even the extreme borders are generally good to very good except at 22mm where they're a little softer at wide-open aperture. Stopping down does slightly improve the performance at 10mm and 14mm whereas it clearly makes a difference at 22mm where the border quality can be lifted good levels at f/5.6 and even very good levels at f/8. Diffraction effects reduce the performance from f/8 onwards.

Below is a simplified summary of the formal findings. The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations

Chromatic Aberrations (CAs)

The EF-S 10-22mm produced another positive surprise regarding chromatic aberrations (color shadows at harsh contrast transitions) - for an ultra-wide lens they can be considered as quite low. In absolute terms CAs can be noticeable at 10mm with an average pixel width of 1.7 pixel at the borders. It's a bit less at 14mm and 22mm.




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