by ʇolɐǝz ǝɥʇ qoq

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Can anyone tell me if the Sigma 50-500mm EX DG HSM lens (non OS model) is compatible with a Nikon D90 body? I recently purchased this lens on eBay but it seems that the lens will not autofocus on my D90. Is this lens only compatible with full-frame DSLRs?

Thanks very much!

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Sounds like you got sold a lemon. It should work just fine, if it won't focus either the motors are broken and/or the other electronics are causing trouble with the camera's autofocus system.

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