Welcome to Nikonians! The D40X does not have an AF motor built into the camera body. As Randy wrote above, the AF 80-200mm f/2.8 is a screwdriver type AF lens and will not Autofocus on the D40X. It will meter and can be used in Manual Focus mode. The only version of the 80-200mm that will provide AF on the D40X is the 80-200mm f/2.8D ED IF AF-S as the AF motor is built into the lens. Good Luck and Enjoy your Nikons!