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Message: <blockquote data-quote="Marcel" data-source="post: 66702" data-attributes="member: 3903">First, if your lens is AI, it should work fine on the D7000.Now for the crop factor explanation, there are no adapters that will reduce the focal length of any lens. The fact is simple. The sensor of the "cropped DX" is smaller than the FX full sensor. The distance from the lens to the sensor plane is the same for both but the sensor is smaller. It's exactly like if you were enlarging a 35mm negative and cropping it to get a smaller image. The image you would get with a 75mm on a FX would be the same one as you'd get from a 50mm on Dx if you stand at the same place and your subject hasn't moved.Hope this helps.</blockquote>