Canon EF 17-40mm f/4.0L USM

Build quality superb, internal focus, super fast and quiet AF. Works great in video mode as well as still photography. No IS but not that necessary for this focal length group. Excellent walk around lens, landscapes, group photos and reasonable portrait lens. Image quality for APS-C format is superb. I use it with a Canon EOS 650D (T4i) body. Be sure to add the 77mm UV-C filter . Use the best quality such as the Hoya HMC UV(C). A protection filter is recommended by Canon to completely seal ...

I had photography class in college but that was a long time ago. So I'm a novice to this hobby.. Anyway, to me this is an impressive lense for the money; especially, for the quality of it and the way it feels on the hand. Technically, it is a faster and quiter lense comparing the kit lense that came with my 650D, and it is a bit more heavier which is expected for this range of Luxury lense. For the 650D this lense is really good for an every day walk about which I have been doing, and it is ...

17-40 is my full frame ultra-wide angle. When I was shooting crop cameras I used the EF-S 10-22. 10-22 with Canon 1.6 crop factor equals to field of view 16-35.2 in 35mm. When you hold both 17-40 and 10-22 in your hand, you can notice how similar both lenses are. Design is almost identical, they cost almost identical.....but 17-40 is so much better! Not only its constant aperture, build quality is sturdier, its weather sealed and slightly longer (40 vs. 35.2) If you have crop camera then ...

I think this is a fine lens, light with a grea range and with very good results. I have only ever used this on full frame cameras (5Dii). I have not had the issues some report with corner sharpness. Stop down to f8 or so and you can relax. If portability is an issue for you - I am a hiker taking landscapes for much of the time - you can't go wrong. Great value for money,

+ Build quality is fantastic. Fully sealed with a front filter. Takes common 77mm sized filters. + Fast, silent and accurate focusing. + Very good center sharpness wide open. - Corners especially at 17-20mm is HORRIBLE on full frame, even stop down to f11 - Vignettes with any filter at 17mm, forget about CPL - F4 too slow for general purpose use, landscape + sunny day only.

Bought this lens basically because I couldn't justify the cost of Canon's 2.8 wide zoom. I tend to carry it about all the time and it has served well in sports, news and travel; it shares the same build quality of the rest of the L-series line and stands up to use in pretty wet conditions. However, at the end of the day it simply isn't sharp enough, even when stopped down. If you need ultimate optical quality, buy one of the L-series fix focal length wides instead. Problems: Unsharp.

well may be this lens is sharp and everything, like a lot of people say. but mine sucks. it is unsharp on the left side at 17mm and unsharp on the right side near the other end. probably bad centered. or something, i dont care, i want to take pictures, not to know stuff about optics. or may be it is somehow broken, but why should it be? sent it in twice, canon says "all's within the specitfactions". stupid company, their gear may look good on paper, but their QC sucks a great deal. will get ...

I used this lens for some years and liked it. I sold my Canon gear and miss it a little bit. The colours of pics taken with this lens are always punchy and clear, no matter what body you use. Great color rendition. Sharpness is very good(I only had APS-C cams but was always satisfied, no matter if used with 8MP 20D/30D or 15MP 500D). AF is fast and zooming is smoth. Build quality is superb. Overall recommended. Problems: There is a slight impact on sharpness at 40mm. Provided lens hood is ...

The EF 17-40mm f/4.0L is a disputed lens. Tests show images that are terrible soft in the corners and there are soo many other, bigger, better ultra wide lenses available. So, whats on the plus side? It is wide. The range from 17mm to around 28mm is huge and the perspective is very different from more common focal lengths. The wide view makes composition difficult if done right ultra wide shots are amazing. AF is fast and reliable, it is a very solid, weather sealed lens, it is (relatively) ...

I use this lens with a full format 5DII and an aps-c 7D cameras pros: HIGH value for price, vivid gorgeous colors, very good sharpness and contrast (best at f:6,3) except extreme corners at 17mm on full format), strong and sealed build. cons: no IS (not a big issue with full format SWide, a bit more on aps-c) intrusive large hood, vignetting at full aperture, some barrel distorsion in 17-20mm range Perfect for landscape, good for reportage (full format) and also good as standard lens zoom on ...