Canon EF-S 10-22/3.5-4.5 USM review
The Canon EF-S 10-22/3.5-4.5 USM is Canon’s widest lens for Digital SLRs. Focus is very fast using Canon’s ring-type USM motor, which also allows full time manual focusing without having to switch from “autofocus” to “manual” mode. The lens does not change length when zoomed and the filter mount does not rotate, facilitating the use of a polarizer.
The Canon EF-S 10-22/3.5-4.5 USM does not come with either a case or lens hood. An optional lens hood [EW-83E] is available (though by current accounts is hard to find right now). Canon list lens case LP1319 as being suitable for the EF-S 10-22/3.5-4.5. To cut the chase, I must say that I am very impressed by the lack of barrel and pincushion distortion in the Canon EF-S 10-22mm f/3.5-4.5 USM Lens. There is a slight barrel distortion at 10mm moving slowly to a slight pincushion at 22m.
On the sharpness issue, I found the Canon EF-S 10-22mm f/3.5-4.5 USM Lens to be a very good performer. Keep in mind that when shooting at these focal lengths, details tend to get extremely small. Our DSLR sensors struggle to produce sharp results when details get down to the pixel or couple-of-pixel size.
The Canon EF-S 10-22mm f/3.5-4.5 USM Lens is a little soft at 10mm with some softness in the corners. Sharpness at 10mm improves slightly when stopped down, but the corners retain some of their softness. At 16mm, the Canon 10-22 has decent sharpness wide open and improves little when stopped down. Sharpness at 22mm was good and again, improved little stopped down. Corner sharpness was best at 22mm. Resulting images take post-process sharpening well.
Name: Canon calls this the Canon Zoom Lens EF-S 10-22mm f/3.5 – 4.5 USM
EF: Electronic Focus
-S: Designed only for the smaller 1.6x sensor of the 20D, 30D and Rebel.
USM: Ultra-Sonic Motor. Focuses silently.
Optics: Thirteen elements, ten groups. One aspheric and one super UD
Diaphragm: stops down to f/22-29.
Minimum Focus: 9.5 inches (24cm)
Size: 3.5″ long
Weight: 13.6 oz. (385 g.)
Filter: 77mm, the professional standard
Case: LP1319, optional.
Hood: EW-83E. The bayonet hood is optional and unnecessary, except for physical protection. I wouldn’t buy it; my Nikon hoods that come standard stay home in their