Quote Originally Posted by thekingb


The EF-S has potentially better IQ,
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I do not totally agree with this statement. I think at all ends of the zoom range they are probably an even trade in IQ, IMO, for what that is worth. I shoot with an f4.0 lens indoors all the time and do not feel I have to go wider. For shooting portraits with good background blur, you have two other lenses to get that. I would stick with the 17-40. Either way you go is good, they are both excellent lenses.


Mark