I cannot fit the Sigma 70-300mm F4-5.6 DG Macro lense to my Nikon D40, am I doing something wrong?
You have to make sure you bought the sigma lens with a NIKON mount. Sigma makes a Sigma mount as well as a Canon mount, of course neither of those mounts will work with your camera. Also you must also make sure your lens is the Sigma 70-300 HSM (/Hyper Sonic Motor) or it will not AF on the D40. I just bought this lens from Abes of Maine and I love it on my D40.
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Not to sound simplistic, Two things. First is the Sigma lens a Nikon mount or is the Sigma lens for the Sigma camera? Second the Nikon D40 is the first Nikon body without a built in auto focus motor. This means that the any lens used with the D40 will need the auto focus motor built into the lens.
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