Will a Sigma 10-20 work on my 5D?

It will fit and you can take a pic but severe vignetting so no point really
 
:agree:
I have a 1Dmk3 which has a 1.3x sensor and the same lens, i cant use it below approx 12-14mm because of vignetting. So as the 5D is full frame the wider end of the lens would cause a lot of vignetting.
 
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