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Title: Incompatability
Review: This Sigma lens is incompatible with the Nikon D3100. It is not an AF lens, and the attachment does not even lock in place. Essentially I've blown the cost of the device -- which was not inconsequential. Since I have a number of other SLR's, (Canon, Sony), I hoped that the lens might be usable as backup for those cameras, but, alas, no soap.
