Metabones Leica R to BMCC Speed Booster 0.64x
Leica-R to Micro-4/3 mount Speed BoosterTM adapters designed exclusively for the Blackmagic 2.5k Cinema Camera (BMCC). Note that the new Speed Boosters will only attach to Blackmagic cameras equipped with a Micro-4/3 mount. They cannot be attached to standard Micro 4/3 cameras.
The new 0.64x Speed Booster reduces the full-frame crop factor of the BMCC from 2.39x to 1.53x, thus effectively transforming it into a Super-35 format cine camera. In addition, the speed of any attached lens is increased by 11/3 stops, with a maximum output aperture of f/0.80. For example, a 50mm f/1.2 becomes a 32mm f/0.80 (i.e, by using 50mm lens, the actual focal length in BMCC is 32mm x 2.39 = 76.48mm), and Sigma’s new 18-35mm f/1.8 will become an 11.5-22.5mm f/1.1. (i.e, by using 18-35mm lens, the actual focal length in BMCC is from (11.5mm x 2.39 = 27.49mm) to (22.5mm x 2.39 = 53.78mm). More detail about crop factors, please refer to the table below:
Table of compatibility and resulting crop factors:
Increase maximum aperture by 11/3 stop. (with a maximum output aperture of f/0.80)
Makes lens 0.64x wider.
Optics designed by Caldwell Photographic in the USA (patent granted).
The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads.
Disclaimer: we are NOT licensed, approved or endorsed by Micro Four Thirds or Leica.
Super telephotos such as the Telyt 560/5.6 may vignette at the corners.
The following lenses require modification in order to fit on the Speed Booster.
Elmarit R 28/2.8
Elmarit R 35/2.8
Summicron R 50/2
Please refer: https://metabones.com/products/details/MB_SPLR-BMCC-BM1