Compatibility Everything works perfectly on every digital Nikon, both FX and DX, and even on Nikon's cheapest digitals like the D40, D40x, D60,D3000, D3100 and D5000. It's also perfect on decent or recent AF 35mm cameras like the F6,F100, F5, N80 and N75, as well as on Pronea APS cameras. Focal Length 36.0mm, as designed. When used on a DX camera, it gives an angle of view similar to what a 55mm lens gives when used on an FX or 35mm camera. Optics 10 elements in 7 groups. One aspherical element. Rear focusing; nothing moves externally as it autofocuses. Diaphragm 9 rounded blades. Stops down to f/16. Close Focus Ratio 1 foot (0.3m). 1:5. Angle of View 63ﾰ on FX and 35mm film. 44ﾰ on small-format DX. 52ﾺ on APS (Pronea). Weight 21.165 ounces (600.0g), measured. Nikon specifies 21.2 oz. (600g).