Silent Wave MotorAF-S NIKKOR lenses feature Nikon’s Silent Wave Motor, which represents a significant advance in AF lens technology. AS AS stands for Aspherical lens elements. This type of lens utilizes non-spherical surfaces on either one or both sides of the glass in order to eliminate certain types of lens aberration. M/A Select NIKKOR lenses have a focusing mode which allows switching from automatic to manual focusing with virtually no lag time by simply turning the focusing ring on the lens. Rear Focusing A system in which only the rear lens group moves during focusing, thus eliminating changes in the physical length of the lens during focusing and enabling faster focusing. Such lenses are designated with RF on the lens barrel. Specifications Mount Type Nikon F-Bayonet Focal Length 35mm Maximum Aperture f/1.8 Minimum Aperture f/22 Format DX Minimum Angle of View (DX-format) 44° Maximum Reproduction Ratio 0.16x Lens Elements 8 Lens Groups 6 Compatible Format(s) DX FX in DX Crop Mode Diaphragm Blades 7 Distance Information Yes Aspherical Elements 1 Super Integrated Coating Yes Autofocus Yes AF-S (Silent Wave Motor) Yes Minimum Focus Distance 0.98 ft. (0.3m) Focus Mode Auto Manual Manual/Auto Rear Focusing Yes G-type Yes Filter Size 52mm Accepts Filter Type Screw-on Approx. Dimensions (Diameter x Length) 2.8 (70) x 2.1 in. ( x 52.5 mm) Approx. Weight 7 oz. (200 g) Supplied Accessories HB-46 Bayonet Lens Hood LC-52 Snap-On Front Lens Cap LF-1 Rear Lens Cap CL-0913 Soft Case