Nikon AF S NIKKOR 85mm f/1.8G Fixed Lens with Auto Focus for Nikon DSLR Cameras Description To focus using autofocus with manual override (M/A): Slide the lens focus-mode switch to M/A. If desired, autofocus can be over-ridden by rotating the lens focus ring while the shutter-release button is pressed halfway (or, if the camera is equipped with an AF-ON button, while the AF-ON button is pressed). To refocus using autofocus, press the shutter-release button halfway or press the AF-ON button again. The fast maximum aperture of f/1.8 performs brilliantly under any lighting conditions and delivers beautiful, natural background blur that brings out the best in any subject. Compatible Format(s) - FX, DX, FX in DX Crop Mode, 35mm Film. Features: Fast aperture medium telephoto lens Internal focus, focal length: 85 millimeter, minimum focus range: 0.80 meter Silent wave motor (SWM). Number of diaphragm blades: 7 (rounded diaphragm opening) M/a focus mode switch. Filter-attachment size is 67 millimeter (p=0.75 millimeter) Nikon super integrated coating (sic) 85 millimeter fixed lens, maximum reproduction ratio 0.12 x Product Details: Brand: Nikon Focal Length Description: 85 mm Lens Type: Telephoto Compatible Mountings: Nikon F (FX) Camera Lens Description: 85 month Product Dimensions: 2.87 x 3.15 x 3.15 inches Item Weight: 12.3 ounces Item model number: 2201 Batteries: 1 Lithium Ion batteries required. Is Discontinued By Manufacturer: No Date First Available: January 6, 2012 Manufacturer: Nikon