Originally Posted by George Slusher
I think the idea is that image circles are more difficult to attain with shorter focal length lenses, and thus it is more of a shame to waste image circle with a short lens. Another way of putting the same thing is that an EF-S lens 24-70 would be much easier to make (and much cheaper) than the EF counterpart, while an EF-S 70-200 would not be.
Yet another way of saying the same thing is that there is probably exists EF-S lens that will give more performance for the dollar on a crop body than the 24-70, which is exactly what you concluded about the 17-55.
(I'm sure Daniel can answer this better than I can. But I'm stuck proctoring a math test and have nothing better to do[])
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