Jim Gifford , Feb 23, 2005; 07:20 a.m.
Aside from the absence of an aperture ring on the "G" lens, you will be hard pressed to tell the difference.
Since you already have a "G" version, don't waste any money to get the "D" version.
This is not true of the G/D pair in the 70-300mm focal length, where at least the makeup of the optical elements is different -- better --in the D version with its ED glass.
But for the least expensive 28-80 lenses that Nikon has offered in three or more versions since the mid 1990s, I see no reason to "collect the whole set." The 28-100 is a kissing cousin to these, by the way. If you have any one of that batch, no need to spend money on any others in a vain hunt for improved performance.
If you want a step up, look into the 28-105 D lens, a terrific value in the Nikkor lineup.