KareBear wrote in post #16415059
No ones ever suggested an L lens to me before, haha. Would it be worth spending the money to use it on a crop body?
I've heard that L lenses don't work as well on crop bodys. That's wrong!
I can tell you from first hand experience that the 70-200 is fantastic on a crop.
There are some things to consider however:
Spending a lot of money for a full-frame wide-angle, on a crop, is probably not worth the cost; the resulting shots won't be that wide; some of the EF-S lenses do better in that space. So, as far as that goes, I believe the EF-S 17-55 f/2.8 is a better choice for a crop than the 17-40L. When I got my 7D, I was torn between the: 24-70 f/2.8L, 17-40 f/4L and the EF-S 17-55 f/2.8 -- after reading the reviews
, the 17-55 looked like the best choice. Cost or the "L" label were not the critical issues: the 17-55 is just as expensive as the 17-40 and, when you added in the cost of a hood and pouch -- both included with the 24-70 -- the 17-55 was nearly as much as the last generation 24-70. The test results from the reviews showed that the 17-55 was sharper than the other two, the auto focus was faster and it was f/2.8 (really helpful for indoor shooting). The 17-55 was also a better range for everyday shooting on a crop than the 24-70 (it mimics the field of view on a crop that the 24-70 provides on a FF).
Canon spends (and charges) a lot of money to get their L lenses sharp out to the corners of the frame, some of that expense is for naught when using a crop; this is especially true for wide angles. The expense of the 17-55 was in making it an f/2.8 lens, sharp to the crop corners.
But, back to the "L on a crop" question, as far as the quality of the resulting images, the speed and accuracy of the focus, the durability of the lens... it is all still good on a crop!