Metabones Nikon G -BMCC Speed Booster 0.64x

Nikon-G/F to Micro-4/3 mount Speed Booster^TM  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:

Optics designed by Caldwell Photographic in the USA (patent pending)

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Features:

• Industry's best aperture ring covers a 8-stop range, 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 1¹/₃ stop. (with a maximum output aperture of f/0.80)
• Increase MTF.
• Makes lens 0.64x wider.
• Click-less manual G aperture ring.
• Optics designed by Caldwell Photographic in the USA (patent pending).
• The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam 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.).

Remark: This mount is manual aperture control. It does NOT support electronic aperture control. 

Disclaimer: we are NOT licensed, approved or endorsed by Micro Four Thirds or Nikon

List of incompatible lenses

Nikkor 2.1cm f/4

Nikkor AI-S 20mm f/2.8

Nikkor E series lens (the diaphragm blades are not operated by mechanical linkage levers, such as Nikkor 105mm f/1.4E, PC-E 24mm, 45mm, 85mm T/S, Nikkor AF-S 70-200mm f/2.8E FL ED VR, and Nikkor AF-S 16-80mm f/2.8-4E ED DX VR)

Related Press Release 2 Dec 2013: Metabones Nikon G to BMCC/BMPCC Speed Boosters Available Starting Today