Nikon Ai-S 20mm f/2.8

The Nikon Nikkor AI-S 20mm f/2.8 is a manual-focus wide-angle lens with Nikon F mount, designed for landscape, architecture, interiors, reportage and creative photography where a very broad field of view is required in a relatively compact package. Its 20mm focal length on 35mm full-frame format provides an extremely wide perspective, making it particularly suitable for emphasizing depth and including large portions of a scene within the frame, while the bright f/2.8 maximum aperture offers useful flexibility when working in lower-light conditions. The AI-S version features an optical construction of 12 elements in 9 groups, with Nikon multi-coating designed to improve contrast and colour rendition while helping to reduce flare and ghosting, both important considerations with ultra-wide-angle lenses. The aperture ranges from f/2.8 to f/22 and uses a 7-blade diaphragm. Minimum focusing distance is approximately 0.25m, allowing photographers to work very close to foreground subjects and create strong perspective effects between near and distant elements. The angle of view on 35mm full-frame format is approximately 94°, while the lens accepts 62mm filters. Focusing is entirely manual and controlled through a wide, precise focusing ring, while the mechanical construction typical of Nikon AI-S lenses provides a solid and traditional handling experience. Autofocus, optical image stabilization and electronic CPU contacts are not included, so metering, focus confirmation and EXIF data support depend on the camera body being used. The lens can be mounted on compatible Nikon film and digital SLR cameras supporting AI/AI-S lenses and, via an FTZ or FTZ II adapter, on modern Nikon Z mirrorless cameras while retaining manual focus operation. Thanks to its ultra-wide focal length, f/2.8 aperture, compact dimensions and classic Nikkor construction, the Nikon AI-S 20mm f/2.8 remains an appealing choice for photographers looking for a distinctive manual-focus wide-angle lens.