Metabones Leica R to Emount Speed Booster ULTRA 0.71x (Black Matt)

Key Features Leica R Mount Lens to Sony E-Mount Camera Ultra-High Index Tantalum-Based Glass Increases Maximum Aperture by 1 f/Stop Increases Angle of View by 0.71x Description The Leica R Mount Lens to Sony E-Mount Camera Speed Booster ULTRA from Metabones improves upon the original Metabones Speed Booster with a 5 element/4 group optical design that incorporates ultra-high refractive index tantalum-based glass for improved sharpness and reduced distortion and vignetting. The Speed Booster ULTRA allows a full frame Leica R Mount lens to be mounted to an APS-C format E-Mount camera and in doing so, increases the angle of view and increases the maximum aperture by approximately one f/stop. When a lens intended for full frame sensors or 35mm film is mounted to a camera with an APS-C sized sensor, it transmits a larger area of light than the smaller sensor was built to accept and therefore the effective angle of view of the lens decreases. The Speed Booster condenses light from the lens