ok, I've finally done it and placed an order for the Sigma 50-500mm zoom. I was trawling the net and managed to find a place on the net selling them new for £659 ! The only thing that worries me is that it only said "50-500mm/F4-6.3 APO" and didn't mention "EX HSM".
Now I am pretty sure that Sigma only make one 50-500mm lens, and I also think that as I have specified a Canon mounting that it will automatically have the hypersonic motor as standard, but does anyone else know any differently


