For you, newbie in DSLR and having Nikon D40 or D40x (like mine). This list might be helpful for your guidance to find compatible auto focus lenses for your camera :) Picture courtesy of kenrockwell.com Nikkor: AF-S DX 12-24mm 4.0G ED-IF AF-S 17-35mm 2.8D ED-IF AF-S DX 17-55mm 2.8G ED-IF AF-S DX 18-55mm 3.5-5.6G ED…