Always happy with Canon Lenses.. I am more a detailed photographer, I purchased this mainly for my husband. He enjoys taking more landscape photography. Overall, very happy!

I was a bit concerned at first with the fixed focal length, but it has proven to be very versatile. It takes very sharp pictures, even when fully opened in low light. I have not noticed any of the vignetting that other users have mentioned.

Bottom line: great wide angle lens for the price. Useful for landscapes and tight space, low light situations.

This is one of the first two lenses I bought when I switched to a Canon SLR about five years ago. I've had plenty of opportunity to use it since then, both with film and (full frame) digital.

The idea behind this lens is a good one -- 20mm is wide enough to allow for landscape and architectural photos, and it focuses close enough for entertaining photos of people's faces, taken about a foot away from their noses (note that you'll need either a ring light or lucky ambient light to pull off the latter). There is some pincushion distortion, but nobody would accuse the results of looking like a funhouse mirror, as would be the case with a fisheye lens, for example.

f2.8 is fast enough; I've no complaints there. Unfortunately, this camera consistently vignettes -- the corners of every image are dim. This is true even with a bare lens, and filters make it worse. You can correct the problem in image editing software, or just crop the image, but what's the point of buying a 20mm lens if you're going to have to crop every photo you take with it?

If this had been a cheap zoom lens, I'd have expected the problem and not been bothered by it. With a fixed lens, however, I think there isn't much excuse.

Canon still charges about the same ($400) that I paid for this lens years ago. By now, they ought to have upgraded this thing, or dropped the price. It is the worst EF lens I own.

If you want a wide-angle lens for a Rebel that doesn't have lots of distortion, this is great. I have taken some very nice shots with this hand-held indoors and outside. The first time I took a stopped-down shot indoors on a tripod, I was really impressed. Because of the crop factor and depth of field, it's eye-popping sharp all over with great color saturation. It costs a good amount, but it's one of the most useful lenses I have.

Drawbacks - A chunk of that price is for the 20mm optics of which we only see the central portion with a cropped sensor. The lens hood is extra. The lens diameter is 72mm so buying a polarizer lens will set you back.

Bottom line: I would give up my 85mm f1.8 and 50mm f1.4 - and maybe even my 35mm f2 - before I would part with this lens. Great for landscapes on cropped sensor cameras. People who have complained about this lens must have gotten a bad build.

I hella enjoy using this lens, its always hooked on my Canon 40d. One of Canons cheap wide lens. Excellent made, perfect.