
Average Reviews:

(More customer reviews)I've used this lens both on 1.6x crop (Digital Rebel XT) and full frame (5D and EOS 3) cameras.
On the 1.6x crop, the 20mm focal length looks like 32mm.I personally find that to be a wonderful focal length for general purpose use, and the f2.8 is acceptably fast for some indoor / low-light situations.
On full-frame, the lens is amazingly wide, and can be challenging to frame an interesting picture.Nevertheless, sometimes you need the lens to be that wide, so it's great to have.On the downside, the lens loses sharpness toward the edges, and is more evident on full-frame cameras than on 1.6 crop cameras.
This lack of sharpness is not always a big deal, as the edges of a photo are usually not the focal point.
I'm overall happy with it, and when I want wide, I usually grab my 20mm over my 17-40mm zoom.
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Product Description:
Wide-angle lenses let you capture more of the image by broadening the angle of view and increasing the depth of field, thereby bringing more of the area into focus. The lenses also provide a unique perspective by expanding the apparent distance between the foreground and the background. This Canon 20mm f/2.8 is no exception, with such additional features as a floating rear focusing system with an Ultra Sonic Motor (USM), a 0.8-foot close focusing distance, and a 94-degree diagonal angle of view. As with all Canon lenses, the 20mm lens carries a one-year warranty.
Specifications
Focal length: 20mm
Maximum aperture: f/2.8
Lens construction: 11 elements in 9 groups
Angle of view: 94 degrees
Focus adjustment: Rear focusing system with USM
Close focusing distance: 0.8 feet
Filter size: 72mm
Corresponding mounts: Canon
Dimensions: 3.1 inches in diameter and 2.8 inches long
Weight: 14.3 ounces
Warranty: 1 year
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