Nikon-G/F to Micro-4/3 mount Speed Booster TM adapters designed exclusively for the Blackmagic Pocket Cinema Camera (BMPCC). Note that this new 0.58x Speed Boosters will only attach to BMPCC equipped with a Micro-4/3 mount. They cannot be attached to standard Micro 4/3 cameras. The new 0.58x Speed Booster reduces the crop factor of the BMPCC from 2.88x to 1.75x, & produces the largest aperture optics currently available, with a maximum output aperture of f/0.74. For example, a 50mm f/1.2 now becomes a 29mm f/0.74 (i.e, by using 50mm lens, the actual focal length in BMPCC is 29mm x 3.02 = 87.58mm), & the Sigma 18-35mm f/1.8 becomes the world’s fastest zoom lens at 10.5-20.3mm f/1.0 with stunningly sharp performance.
Features: Industry's best aperture ring covers a 8-stop range with half-stop markings, clearly indicating actual number of f-stops. No more guesswork! (Patent pending). Compatible to both Nikkor G lens & F lens (include non-AI & AI lens mounts). Increase maximum aperture by 1 2/3stop. (with a maximum output aperture of f/0.74) Increase MTF. Makes lens 0.58x wider. Click-less manual G aperture ring. Optics designed by Caldwell Photographic in the USA (patent pending). The tripod foot is detachable & compatible with Arca Swiss, Markins, Photo cam ball heads. Tips: Before mounting your lens to the adaptor, please make sure that the f-stop of aperture ring on the adaptor is turned to "7" (i.e. mounting your lens to the adaptor while only the aperture ring in the adaptor is full closed.). Please note: This mount is manual aperture control. It does NOT support electronic aperture control.