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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.
Hey SandyG1019, If you just purchased this camera 2 weeks ago it might still be within the retailers return/exchange period, and I would suggest you just exchange it for a new one. This error message should mean that something is obstructing the movement of the lens (i.e. sand), but could also be do to a problem with the lens mechanism itself. If you choose to try and resolve the problem you could try blowing compressed air into the side of the lens to try and dislodge whatever is stuck in the lens. This being said I would suggest instead having the camera looked at by an authorized service technician since the camera is most likely covered under a manufacturers’ warranty, and the repair would most likely be free. I hope this helps! Sincerely, Allan Go Ahead. Use Us.
Hey mcheng, Since I am assuming you have opened the D40 the store can charge you a 15% restocking fee, but with an exchange they rarely do. Without the restocking fee you would just pay the difference between the two cameras’ prices. Remember the return/exchange period on digital cameras' is 14 days. I hope this helps! Sincerely, Allan Go Ahead. Use Us.