The Nikon Autofocus 70-300mm f4-5.6D is a high-powered 4.3x telephoto zoom lens with a rotating zoom ring and ED glass for high resolution and high contrast even at maximum apertures.
The D-type 70-300mm lens' ED (Extra-low Dispersion) glass overcomes chromatic aberration and keeps light of various wavelengths focused at the same point. This results in a sharper, more contrasty image.It will autofocus only with cameras that have an autofocus motor such as D70, D7000. It will not autofocus with cameras like D40, D60, D3000/3001, D5000/D5001.
Nikon D-type lenses transmit subject-to-camera distance information to the camera. The camera uses this distance information to refine its exposure calculations. The D-type lenses are necessary for many newer Nikon cameras to activate 3D Matrix Metering.