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Rating: 
Summary: User experience with Sigma 500/4.5 EX HSM
Review: I am a wildlife photographer in South Africa and I briefly owned both the Nikon and Canon versions of this lens. I used the lens on a Nikon F100 body and found that it did not autofocus properly, due to presumably software conflict between the lens and the body. I swopped it for the Canon version, but it had the same problem when used with the EOS 3. The Nikon version did not autofocus with the Sigma 1.4 and 2.0 APO extenders. The Canon version did focus with the Sigma 1.4 extender, but not with the 2.0. THe lens has exceptionally good optics, and resolution, contrast and colour saturation is excellent. The build-quality is not bad, but not up to the same standard as the equivalent Canon lens. The large tripod mount is very handy, and the lens is very well balanced when used on a tripod. THe lens is very well priced, but unless Sigma ensures that it functions perfectly with the latest top end Canon and Nikon SLR's, it will not be an option for pro's or serious amateurs.
Rating:
Summary: Other choices are better
Review: Similar considerations apply to Canon, so here is what I said about the 500mm f4.5 Sigma vs similar glass from Nikon:The Sigma gets decent reviews, but for the same price you can get a brand-new 400mm f3.5 Nikkor (or a used 500mm f4P Nikkor). THese are sharper, faster, and (IMPORTANT!) better-built. Add a TC-14b teleconverter for about 10% more and you also have a 560mm f5 (or 700mm f5.6) that is sharper than the Sigma. A used 400mm f3.5 Nikkor is maybe $1500 to $2000 (this is the choice most people should make, but be sure you can return it if it's a clinker). A BIGGIE: The resale value of the Nikkor is much better. I could (but never will) sell my Nikkors (bought used) for more than I paid after using them for years. The only "advantage" of the Sigma is Autofocus, which may not work all that well if other reviewers' comments or my experience with a Sigma 400mm f5.6 are any indication. However, if you are a high-end sports freak or flying bird weenie, you already own high-end AF gear, or will be frustrated until you do. Most other subjects don't need AF. Indeed, in a recent butterfly hunt in a wildflower plot, I got consistently better slides in manual mode than an experienced friend with new Nikon AF gear. It's pretty tricky to get the AF to focus on the butterfly's head instead of its back wing or the flower petals. Also, the 500mm Sigma weighs almost 7 lb, more than the far more versatile Nikkor + TC-14b combination. (A 400mm f2.8 AF Nikkor weighs 14 lb! What price AF?) Bottom line: Buy the good stuff -- you get better performance and save money (because of resale value).
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