The AF-S NIKKOR 20mm f/1.8G ED from Nikon is a wide-angle lens that is compatible with both full frame FX and DX crop sensor cameras. The fast f/1.8 maximum aperture allows a shallow depth of field for selective focus use, as well as shooting in low-light situations.
The lens provides a 94° angle of view (30mm, 70° equivalent on DX-format cameras), and has a minimum focus distance of 7.8", allowing you to get close to your subject while isolating it from the background.