Summary: This lens has become my primary lens. I brought it on vacation to Mexico and was able to capture awesome pictures. It's definitely worth the $$... It's not expensive like the l-series, but I can't complain for the $$ I paid for it... It also is nice for video capture... Love it!
This is the ultra-wide prime you've been looking for
G. Ponder "Coppertop", Amazon
16 August 2013
Summary: I purchased this lens after shopping and trying several ultra-wide lens options. I should have tried this one first to save me a lot of time and returns. The lens is well built, has great image quality and is just a well rounded ultra wide angle lens. I bought this to use on a Canon 6D to shoot landscapes and night scenes. Absolutely no regrets.
Summary: This is a perfect lens. The 20mm field of view is close to a persons normal field of view. What I see through this lens is more in line with what I am looking for as opposed to the 24mm 2.8. Do not get me wrong the 24mm is great, but the 20mm is more pro looking with its large 72mm filter thread and larger overall size than the 24mm with it's 58mm filter size. This can be a soft lens in the corners if you shoot wide open. Your field of view is curved so compensate.
Summary: ok, so i got this lens because i wanted a compact wide angle lens that i could easily throw in my bag to cover events. however , i was greatly disappointed with the lens. it vignettes like there is no tomorrow, even using profile corrections on photoshop wont get rid of all the vignetting. PLUS this vignetting is not a pleasing vignette. its dark, ugly, and what it does is under expose images by more than a stop. another major issue is image quality.
Summary: Great lens for landscape photos. Only had it a few days, but very happy with the results. Much better than the wide angle zoom it replaced. Also works well indoors for family gatherings. Too wide for my Canon 580 flash, but my 6D has great low-light capability. No problems so far.
Conclusion: I've had this lens for several years. The images are soft at all apertures. There's a color cast. There's massive vignetting, though PIC removes it pretty well. You'd be better served to save your money for the 17-40 zoom.
Cons: Semi-sharp images, color cast, intense vignetting
Summary: I bought this lens with some skepticism because of some bad reviews. The truth is that I found this lens to be an exceptionally high quality lens, with great IQ and well built. It has become my walk around lens, I have learned to appreciate the wide view provided by this focal length. I use it with the Canon 5D Mark II, I a not sure if that is the reason of its excellent behavior. In any case, I love it and I recommend it.
Summary: received this lens within the same week of purchasing. in great condition and was also affordable. i almost returned it due to it being a mix up on the order (mistake on my part) but decided against it. thanks for the reliable service. would def buy from this person again!