Awesome, I can't imagine not having this in my camera bag.
2 weeks ago
Summary: This is a very inexpensive, understated lens that will not fail. Full frame users may see some vignetting at 2.8 but that is not a problem for the prosumer or entry level cameras. Remember, for those affected by crop ratio that the effective focal length is about 64mm which just so happens to make this an acceptable portrait lens. You can get some very nice natural light candids at 1600 ISO.
Summary: Nice lens but I'm a Sony shooter and don't know much about Canon. I only bought this to use on a small Canon 20D EOS just for fun. Turns out the Camera was not working properly and now I have a lens which if I want to continue using, I have to buy an adapter for my Sony camera. Not too bad overall, but not my original plan to try a Canon on for fun.
Conclusion: After shooting with this lens I think it has a very useful field of view; decent optics, a usable autofocus, and strong contrast with good color rendition. Optically it is not superb but in the context of price, size, and weight this lens is a very handy thing to have around. I use a full frame camera but if you have EPS-C this would probably be a real interesting portrait lens wide open.
Pros: lightweight, value, useful in a lot of situations, sharp at full frame
Summary: ...Unless you can find another 40mm f/2.8 AF lens for $150. Great lens on a Full Frame. Makes my 5DmkII into a great "walk around" kit that doesn't get many looks and is probably mistaken for a point & shoot by some people. Adds virtually no weight to the camera and focuses quickly and quietly. Not great for manual focusing, but that is fairly self-evident by the size of the ring. I've used it on my crop sensor cameras like the 60D.
Versatile focal length for both full frame & APS-C
Michael Sandman, Amazon
12 September 2013
Summary: This is a surprisingly good lens - a more-or-less "normal" prime on both a full frame and a camera with an APS-C size sensor I bought it for night photography on a Canon 5D Mark II, because the focal length is useful and a zoom tends to be more susceptible to flare than a prime. I use it most of the time at at f/8, and teh image quality is very sharp across the frame, even on the full frame camera.