cover image

Lens adapter

From Wikipedia, the free encyclopedia

In photography and videography, a lens adapter is a device that enables the use of camera and lens combinations from otherwise incompatible systems. The most simple lens adapter designs, passive lens adapters provide a secure physical connection between the camera and the lens. Some passive adapters may include a mechanism for manual iris control. So called, active lens adapters will include electronic connections, enabling communication between the lens and the camera.[1]

Two passive adapters to mount lenses to Sony E-mount cameras – for Exakta (left) and for Minolta SR/MD lenses (right).
This lens adapter is a passive adapter designed for mounting a Nikon F-mount lens to a Micro Four Thirds camera.

Some lens adapters include a special optical element called a telecompressor, focal reducer, or more recently a "speed booster", a genericised trademark that refers to the Metabones Speed Booster line of lens adapters.[2] This type of adapter is designed to reduce focal length, increase lens speed, and in some instances improve MTF performance. Another innovator in the field is KIPON, a German/Chinese co-operation between Kipon and IB/E Optics.[3] Another branch of lens adapters include an ND-filter to simplify changing lenses, which HolyManta introduced in 2013.[4]

The depth-of-field adapter (also called a DOF adapter or 35 mm adapter) is a largely obsolete device that uses a ground glass focusing screen to enable the use of interchangeable lenses on a fixed lens camcorder.[5] There are also lens adapters made for other optical systems, including microscopes and telescopes.