Reviews and Problems with Canon EF 17-40mm f/4L USM
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Not the best f/4 lens. Disappointed :(
susan g basbus, Amazon
12 July 2014
Summary: When I received the lens everything looked great. Bbc.co rey well wrapped and and in good condition. When I started to do a deep examination I noticed that under the UV lens protector the circular plastic that goes around the lens was loose and when I took it out was broken.
Excerpt: It might just be a problem with the new 5D MKIII but unless you are setting exposures entirely manually it is very problematic. It grabs the brightest spot in your frame and adjusts to that so you end up with sometimes with as much as 90% black silhouettes and blobs and then 10% of properly exposed...
Pros: Durable, Sharp
Cons: Exposure problems, Metering Problems, Poor in Low Light
Conclusion: Very soft at F4, only ok at 5.6, sharp at F8, F11. For the L Lens hype and the price I expected better. My 18-55 kit lens is as sharp and in some cases as at F4 sharper. The lens was replaced the same week I bought it and the second one was the same. I got the money back.
Excerpt: Unfortunately, I have to write my first negative review for a canon lens. I bought this lens to replace my canon 17-85mm. I was very disappointed when I saw that L lens is actually performs worse than my 17-85mm. 17-40mm is unexpectedly soft at f4 both in the center and corners.
Pros: Durable, Fast / accurate auto-focus, Lightweight, Strong Construction
Excerpt: I purchase this wide angle lens for landscape photography with the 5D markii. After reading all the good reviews I decided to give it a try. I was very dissapointed. My images came out soft even in the center. [...] I'm wandering if I ended up with a bad copy!
Conclusion: I have owned this lens for several years and use it to shoot kitchen interiors. Shots are often tight with the need for wide angle. I bought this over the 16-35mm due to the price. However kitchens are full of linear / vertical geometry and we shoot parallel and level.
Conclusion: I owned this lens for quite a while, but rarely used it because the image quality was not acceptable. This would be a very useful focal length / range and it is too bad that it is not at all sharp.
Conclusion: i got this lens 3 days ago and i was testing it heavily on my canon 40d camera. i have to say that i love the built quality and quiet and fast usm. the problem is that my lens didn't produce sharp images at all. i shoot in raw and i had to correct sharpness on every single photo.
Conclusion: I have been quite disappointed in the quality of images produced by the 17-40mm L USM lens. With the L designation, wide-angle optics, and the lofty price, I'd expected tack-sharp image quality.