Canon EF-S 10-22mm f/3.5-4.5 USM - Retest @ 15MP / Review
Lens Reviews -
Canon EOS (APS-C)
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Special thanks to Rainer Temme for providing this lens!
The Canon EF-S 10-22mm f/3.5-4.5 USM is Canon's ultra-wide angle zoom lens solution for their lineup of APS-C DSLRs. Its zoom range is equivalent to about ~16-35mmon full frame cameras. The EF-S naming refers to Short-back focus design which is only compatible to APS-C EOS SLRs starting with the EOS 300D (Digital Rebel). EF-S lenses feature a protruding rear element which requires a special mirror design to avoid a collision of mirror and the rear part of the lens. The principal idea is the reduce the distance of lens to the sensor which can translate to a better lens design - on paper at least.
One of the things you notice upon first contact is its (pseudo-)IF design - the lens does NOT extend during zooming. There is a moving inner tube according to the zoom position (similar to full-frame Canon ultra-wide zooms) but this does not affect the physical length of the lens. It makes still sense to add a filter to shield this portion of the lens. Officially the lens is not sealed and therefore not dust-proof though - this feature is limited to recent L class lenses.
The build quality feels a bit better compared its cousins like the EF-S 17-85mm f/4-5.6 USM IS. The focus ring remains in line with the usual consumer-grade quality but the broad rubberized zoom ring feels pretty smooth. The plastic quality is very decent (not yet L class quality though). The constant length throughout the zoom range certainly helps to keep the positive impression.
The lens has a very fast and near silent ring-type USM (ultrasonic) AF drive which provides full-time manual focusing in one-shot AF mode. The AF accuracy was spot on during the tests.
|Equiv. focal length||16-35 mm (full format equivalent)|
|Equiv. aperture||f/5.6-f/7.2 (full format equivalent, in terms of depth-of-field)|
|Optical construction||13 elements in 10 groups inc. 3x aspherical and 1x SUD elements|
|Number of aperture blades||6 (rounded)|
|min. focus distance||0.24 m (max. magnification ratio ~1:6 @ 22mm)|
|Dimensions||83 x 89 mm|
|Filter size||77 mm (non-rotating)|
|Hood||optional, petal-shaped, snap-on type|