I'm looking to buy some Nikon glass and I have a budget that fits in the range of a 24mm f/2.8D prime lens and the 28mm f/2.8 prime lens. Correct me if I'm wrong, but my assumption is that the only difference between these two lenses is the length (is that the right term?) I do a lot of work in low-light situations and I don't like flash all that much. I am mainly looking to use this as a portrait lens (I already own the 50mm 1.4) so I'm looking for something that can shoot a bit wider. I also would like to find a nice prime lens to possibly shoot some landscape shots. Anyone with experience with either lens would be helpful or just advice in general. Thanks!