Technically, G type just means it has no aperture ring on the lens. That saves cost and weight.
But is it good or bad? Depends on your camera(s). For a D100 and some other bodies, the aperture ring is a pain, as if it ever comes unlocked, you can't use the camera tilll you notice and relock the ring.
For some older (film) cameras, without a ring, you can't realistically use the lens. So if you have or expect to get a (used) film body, consider that.
The rest of the bodies (I think including the D1x) can either use the camera's aperture adjustment or the lens' one, and some prefer to use the one on the lens. So there may be a preference thing.
One final point. Till recently, the G lenses were the cheaper versions, meaning not only inexpensive, but other costs, features, and maybe build quality were cut. For example, I believe that there were no AF-S G lenses before the 24-85. Anyway, if you see a G lens, be more careful about the rest of the lens' quality, as some of them were definitely "consumer" grade. For this, read some reviews on the lens.
Can any body tell me the diffrence between the G type and D type
lenses? For D100 what lenses should I be consedering and what not?
Any help will be appriciated because I'm in the final process of
buying lenses...
Thank you...
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DaveA