|Peter Kwok | profile | all galleries >> Lens Showcase >> Canon 10-22 f/3.5-4.5||tree view | thumbnails | slideshow | map|
|Center Sharpness||Excellent, resolution and sharpness, similar to my 17-40L, even wide open at f3.5, but not as sharp as my 17-55 f2.8 IS.
Its sweet spot is somewhere between f5.6 and f8
|Edge Sharpness||A bit soft and lower contrast when wide open. Not as good as my 17-40L on a 1.6 crop body.
Greatly improve when stopped down to f5.6
|Distortion||Surprisingly good for an ultra-wide angle lens. Even better than my 17-40L.
For critical architectural shots, it is easily correctable by Adobe LightRoom or PT Lens.
However, low rectilinear distortion does not mean the absence of perspective distortion associated with all wide angle lens. See my write up here.
|Chromatic Aberration (CA)||CA is the weakest link of this otherwise excellent lens.
CA is noticeable, more than 1 pixel wide in the magenta/green, especially on the wide end of the zoom. But all ultra-wide lens have this problem.
Adobe LightRoom 2 can do a great job of removing CA. At 10mm, a red/green setting of around -35 works best. I don't see any yellow/blue CA.
The lens profile in Adobe LightRoom 3 can do an even better job. It eliminates almost all traces of CA.
After 4 years of heavy use, I did not have a single shot ruined by flare.
It is better than my 17-40L and a lot better than my 17-55 IS.
I use the hood that came with the 17-40L, not to prevent flare, but to protect it from elbows in crowds.
|Auto-Focus||AF by USM is fast and silence.
With its DOF, focus is always accurate.
|Close Focus and Magification||With a minimum focus distance of 9", it yields a magnification of 0.17x. This allows me to take photographs of my food without getting up from my seat.
22mm is easy to handhold in dim light. With the 17-55IS, I would have to stand up, which is not polite.
|Build Quality||It is not an L lens. Smaller and lighter than the 17-40L and all its 3rd party alternatives.|
|Price||It costs more than lens from Sigma or Tokina, but you get consistent QC. Before you complain, check the price of Nikon’s 12-24mm.|