Quote:
Originally Posted by OldBoy
... but the Sigma 17-70mm 17-70mm f2.8-4.0 DC Macro OS HSM Lens is rated highly. 
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Maybe, but it's not full-frame
I always wonder why people who want to move to 'full-frame' need advice, and think it's probably because they've been sold it as a holy grail. I'm sure that lenses like the sigma 70-300 and 100-300 will be more satisfying on an APS-C camera than on a 35mm format.
Chris