I would like to try my hand at macro photography but know little of the lenses required for macro. Can anyone suggest a good macro lens for Nikon? I see the Nikon 105mm and Nikon 60mm mentioned quite a bit but I don't know the relative differences between the two. Are there other macro lenses I should add to my search? I'd also like a lens that has some use as a standard lens (non-macro shooting) so how do these fare in regular use?