Nikon AF-S FX NIKKOR 20mm f/1.8G ED Fixed Lens with Auto Focus for Nikon DSLR Cameras Compact, lightweight, FX-format lens that combines the ultra-wide perspective of a 20mm focal length, the low-light capabilities and shallow depth of field of an f/18 maximum aperture and the superb optical characteristics of an advanced NIKKOR prime lens Maximum reproduction ratio: 0.23x.Aspherical lens elements and Extra-low Dispersion glass elements with Nano Crystal Coat combat sagittal flare and chromatic aberration for superb, sharp rendering across the entire frame Innovative Silent Wave Motor (SWM) uses ultrasonic waves for fast, acurrate, near quiet autofocusing as close as 78-inches from your subject Delivers a 20mm, 94 degree angle of view that's ideal for stills or motion capture, Minimum focus distance is 0.66 feet from focal plane Produces beautifully blurred backgrounds in your photos and HD videos and lets you shoot at lower ISO settings to retain high image quality at its maximum aperture setting of f/18