Metabones Contax Yashica to Emount Speed Booster ULTRA 0.71x (Black Matt)

Key Features Contax Yashica 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 Contax Yashica 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 Contax Yashica 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 l