The Metabones Speed Booster Ultra 0.71x for Nikon F Mount Lens to Micro Four Thirds Body allows you to mount a full-frame or APS-C Nikon F lens on a Micro Four Thirds body. In doing so, the optics of the adapter help to maximise the apparent angle of view of the attached lens whilst providing a one-stop increase in aperture for the body across the entire aperture range of the lens. If a lens designed for 35mm film or similar full-frame sensors as well as APS-C sensors is connected to a body with a Micro Four Thirds-sized sensor, it would project a larger image than that which the Micro Four Thirds sensor is designed to accept. Being able to capture only the central portion of the projected image, the effective angle of view of the lens would be reduced, creating a "crop factor" on the body. The Speed Booster Ultra 0.71x for Nikon F Mount Lens to Micro Four Thirds Mount condenses the light from a lens designed for APS-C as well as for 35mm film, or "full-frame" body sensors, and projects it onto a Micro Four Thirds sensor. This allows a Micro Four Thirds sensor to utilise more of the light captured by an attached lens, effectively reducing the crop factor whilst making available an additional stop of light to the sensor for each of the lens's aperture settings. This adapter is constructed from aluminium alloy to ensure durability whilst minimising weight, and its mounting rings are made from brass to further prevent wear. Inside are five optical elements in four groups designed to provide optical clarity as well as colour fidelity, and a removable tripod foot is included, which features 3|8" threads and is compatible with Arca-Swiss quick-release plates. The Speed Booster Ultra 0.71x for Nikon F Mount Lens to Micro Four Thirds Mount does not support electronic communication between the body and the connected lens. To help determine the amount of light entering a Micro Four Thirds body when using this adapter and a Nikon F mount lens, an aperture ring is integrated into the Speed Booster Ultra 0.71x for Nikon F Mount Lens to Micro Four Thirds Mount. The aperture ring is designed to provide aperture control for Nikon G-type lenses, which do not have an aperture ring. Nikon AI or many post-AI Nikon lenses can have their aperture settings extended or reduced using their integrated aperture control rings if desired. - Allows the use of a full-frame AI or post-AI Nikon F mount lens as well as an APS-C lens with a Micro Four Thirds body - Maximises the apparent angle of view of the body and lens combination - Provides a one-stop increase in aperture for the body across the entire aperture range of the lens - Five optical elements in four groups for optical clarity as well as colour fidelity - Removable tripod foot, Arca-Swiss compatible with 3|8" threads - Aluminium alloy components to reduce weight - Brass mounting rings to prevent wear - Locking mechanism for secure lens attachment with release button Technical Specifications - Compatibility: Nikon F Mount Lens to Micro Four Thirds Body - Crop Factor: 0.71x - Groups|Elements: 4 | 5 - Length: 2.6 x 0.9" (6.5 x 2.4 cm) - Weight: 6.0 oz (170.0 g)