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Sigma makes their lenses with a variety of mounts. If the lens has a Canon or M42 mount then there is no problem. If it has a Minolta mount, for example, then replacing the lens will be easier and just as cheap as changing the mount. If it has Nikon mount, you can buy adapters to fit it to Canon or M42 bodies.
No. The Nikon F mount has a longer flange focal length than the Pentax K. What this means is that a lens adapter to fit a K mount lens onto a F mount body would have to have a negative thickness, which is a bit difficult to build with current technology. Adapters going the other way are possible and available.
If you want to do the replacement yourself, you can order the part from
http://uscamera.com/1c999-729.htm
I doubt that any Sigma mount part will fit onto any Nikon lens, as this part isn't interchangeable among Nikon lenses. The side of the mount that fits onto the camera is the same for all of them, of course, but the other side is specific to the lens.
That particular lens should work on the D40 if it is made for the Nikon mount. If not, you'd need an adapter to fit it to the Nikon mount. (i.e. if it is a Canon-type lens, you'd need a Canon-to-Nikon lens mount adapter). You'd probably have fair luck selling it on eBay and buying the right kind of lens for your Nikon.
Getting functionally useful adaptors from any other brand to Canon EOS is difficult as the register distance from the sensor to the lens is the deepest of all current lens mounts. Adaptors therefore require expensive optical correction in order to preserve infinity focus ability and given that the adapted lens will still be substantially crippled most owners aren't prepared to pay for such an adaptor. In any case, the additional optical elements will reduce optical quality.
Due to similar electronics, it is possible to physically convert a Sigma mount lens to EOS by fitting an EOS lens bayonet but it's a skilled job requiring fabrication skills and even then there's no guarantee that the lens will communicate correctly with all EOS bodies. In practice, due to the scarcity of Sigma mount lenses the conversion is usually the other way around.
Every lens made after 1996 with AF is made for that particular body. Hence the reason many small camera stores when bust, carrying a huge inventory for the 6 or 8 different cameras out there.
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.
If you don't know how to fix it yourself send it to Sigma UK (01707 329999). They are quite resonable charges for that sort of fault. Their website give a price guide depending on lens and fault. Steve
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