Originally Posted by Jordan
I don't understand why it's a "waste." What is wasted? Certainly not center sharpness, as nice L glass on an APS-C body takes advantage of a great lens' center sharpness and can all but eliminate corner softness and vignetting issues. Why is that a bad thing? For that matter,I use the 70-200 f/4 IS (L glass made for a full frame) on my 7d as often as possible, and the results are often stunning -- certainly not a waste.
Is it money that's wasted? Not in this case. The 17-40L is $300 less than the 17-55.
Wasted focal length? Not in this case. I agree that it's hard to get really wide on an APS-C body, and that 17mm on a FF body is amazing, but the 17-40 and the 17-55 are identical on the wide end.
To me, the relevant question when deciding on a lens of similar focal lengths is this: which lens provides the best combination of IQ, build quality and resale value for the cost? EF vs. EF-S is essentially irrelevant, except that EF-S lens sometimes lag in resale value.
I just don't follow the logic....
BTW, I've decided to stick it out with the 17-40 for now, mostly due to cost considerations, and also because I can eek out higher shutter speeds in low light due to my new(ish) 7d's high ISO performance. Thanks to everyone for their input!
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