The Metabones Speed Booster Ultra 0.71x adapter for Minolta MD mount lens to Micro Four Thirds mount body allows you to mount a Minolta MD mount lens on a Micro Four Thirds mount body. In doing so, the adapter's optics help to maximise the apparent angle of view of the attached lens while providing a 1-stop gain for the body across the entire aperture range of the lens. If a lens designed for 35mm film or similarly sized full-frame camera sensors is connected to a camera with a Micro Four Thirds size sensor, it would project a larger image than 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" in the body. The Metabones Speed Booster Ultra 0.71x adapter for Minolta MD mount lens to Micro Four Thirds mount body condenses light from a lens designed for 35mm film or "full-frame" camera sensors and projects it onto a Micro Four Thirds sensor. This allows a Micro Four Thirds sensor to make use of more light gathered by an attached lens, effectively reducing the crop factor while making available to the sensor an additional stop of light for each of the lens's aperture settings. This adapter is constructed from aluminium alloy for durability while minimising weight, and its mounting rings are made of brass to further prevent wear. Inside are five optical elements in four groups designed to deliver optical clarity and colour fidelity, and a removable tripod foot is included, with 3/8" threads and compatible with Arca-Swiss tripod heads. The Metabones Speed Booster Ultra 0.71x adapter for Minolta MD mount lens to Micro Four Thirds mount body does not support electronic communication between the attached body and lens. To help determine the amount of light entering a Micro Four Thirds mount body when using this adapter and a Contax/Yashica mount lens, users should use the aperture ring present on the lens. - Allows the use of a full-frame Minolta MD mount lens with a Micro Four Thirds mount body - Maximises the apparent angle of view of the body and lens combination - Provides a 1-stop gain for the body across the entire aperture range of the lens - Five optical elements in four groups for optical clarity and colour fidelity - Removable Arca-Swiss compatible tripod foot 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