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The AF NIKKOR 20mm f/2.8 D Lens will not autofocus on the D5100 but is otherwise compatible. For a lens that will autofocus on the D5100 look for lenses the AF-S designation like the AF-S NIKKOR 20mm f/1.8G ED Lens or the AF-S NIKKOR 50mm f/1.8G Lens. The D5100 does not have a built-in focus motor, so lenses that have focus motors are needed for autofocus. AF-S lenses feature Nikon’s silent-wave autofocus motor. Older AF-I lenses will also autofocus on the D5100.
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