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Metabones Canon EF To BMCC T Speed Booster 0.64x (MB_SPEF-BMCC-BT1)

Metabones Canon EF To BMCC T Speed Booster 0.64x (MB_SPEF-BMCC-BT1)



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  • Increase maximum aperture by 11/3 stop. (with a maximum output aperture of f/0.80)
  • Increase MTF.
  • Makes lens 0.64x wider.
  • Optics designed by Caldwell Photographic in the USA (patent granted).
  • When using with "passive" (without electronic control pin) MFT camcorders/cameras, such as BMCC 2.5K MFT and Digital Bolex D16 MFT, the Speed Booster must be powered by external power source via Micro-USB socket. Input Voltage is 5V DC.  (Battery is NOT included in the box).

Canon EF to BMCC mount T 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.  

Supported Not supported 

EF lenses

BMCC 2.5K*, BMPCC and Digital Bolex* D16 MTF camcorders

Image stabilization (IS) lenses

Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L) on BMPCC

EXIF (focal length, aperture, zoom range) on BMPCC

Distance and zoom display on BMPCC (with active MFT mount) camcorder (see note 1). However, this feature is not for BMCC 2.5K.

Contax N mount lenses modified to Canon EF by Conurus (see note 2)

Contax 645 NAM-1 adapter modified to Canon EF by Conurus (see note 2)

Sigma, Tamron and Tokina lenses in Canon EF mount (see note 2)


EF-S lenses


Lens correction such as peripheral shading, CA and distortion

Focus confirmation "chip" (e.g. Dandelion)

M42 screw mount adapters (see note 5)

Stacking non-Metabones/non-Conurus mount adapters on top (see note 6 and list of lenses which require modification below.)

Lens: Tamron SP 17-50mm F/2.8 XR Di II VC

List of lenses (have been tested by metabones) with support on EF-BMCC Speed Booster. (Lenses which have been tested with EF-E Speed Booster may refer to EF-E Speed Booster product page.)

Canon EF zooms

Canon 20-35mm3.5-4.5

Canon 28-80mm2.8-4L

Canon 70-200mm2.8L

Canon 24-70mm2.8_II

Canon 24-105mm4_L

Canon 70-200mm4_L

Canon 70-300mm4-5.6L

Canon 70-300mm4-5.6

Canon EF primes

Canon 50mm1.8

Canon 50mm1.4

Canon 85mm 1.2

Canon 100mm 2.8


Sigma 18-200mm3.5-6.3

Zeiss 35mm2


List of manual focus lenses which REQUIRE MODIFICATION to be used on Speed Booster

Many manual focus lenses have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of Speed BoosterTM They need to be modified before they can be safely used on Speed BoosterTM Check and make sure there are no rear protrusions from the adapter/lens combination before using on Speed Booster. Scratches and damages caused by rear protrusions or by poor quality adapters are not covered by warranty. The following is an incomplete list of lenses known to be incompatible.

Leica R

Super-Elmar-R 15mm

Elmarit R 28/2.8

Elmarit R 35/2.8

Summicron R 50/2

Nikon F

20/2.8 AI-S

Olympus OM

OM 18/3.5

OM 21/2

OM 21/3.5

OM 28/2.8

OM 50/1.8

Pentax K

Every Pentax K-mount lens has a protruding fin and an aperture lever. It does NOT fit.



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