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Canon EF 17-40mm f/4L USM

ef17-40_4l_1_
Review Date: Aug 19, 2010 Recommend? no | Price paid: Not Indicated | Rating: 4 

Pros: excellent built quality, fast and silent
Cons:
lack of sharpenss

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. i tested this lens shooting landscape and then at home on tripod comparing it to canon 18-55 kit lens that i got for 35 second hand. there was no or very little difference. i tested it with and without filters, using F4, F8, F11 and F22 at ISO100-400 using AF and MF.
it was very frustrating experience. i have Canon 70-200 F4 lens and the IQ is superb. i was expecting the same from Canon 17-40 lens as it is a member of L series.
either i'm not lucky and my copy of this lens has some fault in optics or it's a wide angle thing - images in general are not that sharp. i don't know but my decision was to return this lens.
shocking for me was that it was impossible to find difference between images from this lens and 18-55 kit one. little bit better colours but both lenses produce photos of same quality sharpness which for me is unacceptable.
if you buy it i just hope you'll have more luck then me.