on the topic of the sigma APO's.... I currently have a Sigma 170-500 f/5~f/6.3 APO and its VERY NICE! ebay is your friend, many sellers have these for under 700 delivered... Good focal length for the $$ and as far as sharpness goes... Razorblades aint got nothing on them!!
Also, Sigma have a 70-200 f/2.8 which I've used side by side with my mates canon 70-200 f/2.8L and I honestly couldnt tell the difference in any way (physical, or image quality) apart from the fact that the sigma one was black and the canon L was white... at nearly $1000 less, I wonder... Whats in a name?
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