"Motorcyclesaur" <it> wrote in message
You can't compare G to D, at least not in terms of optical quality or
robustness of build. For that, you have to compare on a lens by lens basis.
G means that the lens has no aperture ring and thus, if you care to control
your aperture, can only be used on newer Nikon cameras such as the N80,
F100, F5, D100, and probably a couple of others I'm not aware of.
D means that it has the Distance chip in it. This feeds the distance of the
subject to the camera (roughly). This is most beneficial in some flash
situations. All G lenses are also D lenses.
ED means the lens incorporates Nikon's Extra low Dispersion glass. Keeps
light from scattering and ideally provides for sharp, contrasty images.