Tamron 70-300mm f/4-5.6 Di LD Macro Autofocus Lens for Nikon AF

This Tamron AF 70-300mm f/4-5.6 Di LD Macro Lens made for the Nikon SLR system incorporates a motor built into the lens itself, which gives it the capability to autofocus with all Nikon DSLR cameras (including the D40 and D40x). In addition, with the motor built into the lens, focusing will be quieter and more responsive.