"KIPON. Adapting by Design. Kipon Baveyes Ultra 0.7x Adapter for Pentax 645 Medium Format Lens to Leica M Camera is a Hight Quality optical adapter witch allowes a Pentax 645 Medium formet lens to mount onto a Leica M Camera body. The 0.7x Optic adapter gets rid of crop factor, and increases the aperture. PLEASE NOTE: With This Adapter although the lens will fit physically, auyomatic diaphragm, auto-focusing, or any other functions will not work. you can shoot with maual mode with Leica M Cameras. A simple Kipon lens adapter enables the use of camera and lens combinations from otherw ise incompatible systems with a secure connection between the camera and the lens. More advanced Kipon lens adapters include electronic connections, enabling communication between the lens and the camera so that automated processes like exposure information and auto focus are carried out transparently. The most advanced Kipon lens adapters features autofocus, auto exposure, aperture operation and relates all EXIF data to the camera body. The internal chip containing the adapter's firmware is USB upgradable so that the adapter will always be technically ready for action. Infinity focus is retained in this design, and manual focusing is possible. Kipon produces a variety of designs in adaptation, imparting speed enhancements, automation reliability, including fine image control and, finally, bridges the world of DSLR lenses to SLT and Mirro|Adapts Pentax 645 Medium Format Lenses to Leica M Camera|Magnifies the lens angle of view by a factor of 0.70x, effectively negating thecrop factor while simultaneously increasing the maximum aperture of the lens by one stop|Optical design uses four elements in four groups to retain maximum image quality|Removable tripod foot has 1/4""-20 socket for direct mounting on a support system, eliminating unnecessary strain on the camera's lens mount|Metal construction for long-term durability|PLEASE NOTE: With This Adapter although the lens will fit physically, auyomatic diaphragm, auto-focusing, or any other functions will not work. you can shoot with maual mode with Leica M Cameras"