Works very well for landscape photography
There is a lot of negative reviews about this lens on the internet. The lens performs very well for what I use it for, namely landscape photography. I have tested this lens against the more expensive offerings from Canon (16-35) and the 17-40 performs very well at f/8 and beyond. If your primary use of the lens is for landscape photography I can stronly recommed this lens but if you are lookign to shoot wide open with this lens you will be better off with the 16-35.
noriravi
Manchester, CT