List Price: $539.00
Sale Price: $489.00
Today's Bonus: 9% Off
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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