Canon EF Lens to RF-mount T CINE Speed Booster ULTRA 0.71x

Optical     Increase maximum aperture by 1 stop. (with a maximum output aperture of f0.9).     Increase MTF (details).     Makes lens 0.71x wider.     Advanced 5-element4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic in the USA (patent granted). Electronic     Autofocus.  AF speed is properly adjusted to account for and leverage the shorter focal length and the brighter maximum aperture.     Dual-pixel autofocus (DPAF) and video AF support.     Focal length and aperture are adjusted in EXIF (see note 3).     Image stabilization (IS) lens support.     Store EXIF data (lens name, focal length and maximumminimum aperture) for one manual lens in the adapter.     Build-in multi-function Control Wheel (turn push-in) for assignable functions(eg. ISO, shutter speed or aperture control, depth-of-field preview).     Cinema EOS lens (CN-E 18-80mm T4.4 L) support with the supported camera (eg. EOS C70).     LED indicator shows communication status.      Powered by camera body. With most lenses, no external power source is required.     Cinema camera Canon EOS C70 and RED KOMODO 6K support. Mechanical     Patented positive-lock EF lens mount.     The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.     Flocking to reduce internal reflection.     Rubber gasket protects the RF mount connection from dust and moisture.     Aluminum alloy and brass construction with chromium plating.     Satin surface finish.