Key Features

Optical
- Canon EF mount lens to Blackmagic Design cameras with M43 mount, specific for BMPCC4K.
- Increase maximum aperture by 1-stop. (with a maximum output aperture of f/0.9).
- Increase MTF.
- Makes lens 0.71x wider.
- Patented 6-element/4-group optical design by Caldwell Photographic in the USA.

Electronic
- Lens iris/aperture is set by the controls on the camera body.
- Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lens models.
- Image stabilization (IS) lens support.
- Push autofocus if supported by camera.
- Cinema EOS lens support (CN-E 18-80mm T4.4 L), including AF (requires external 5V power via micro USB port), auto iris and servo zoom.
- Powered by camera body. With most lenses, no external power source required.

Mechanical
- Patented positive-lock EF lens mount.
- Detachable tripod foot compatible with Arca Swiss Style ball head, such as Markins and Photo Clam or attach to quick release plate by a 1/4"-20 screw.
- The tripod foot is tailor-made to match the exact height as the BMPCC4K camera body.
- Flocking to reduce internal reflection.
- Rubber gasket protects M43 mount connection from dust and moisture.
- Aluminum alloy and brass construction with chromium plating.
- Satin surface finish.


Compatible Cameras
- BlackMagic Pocket Cinema Camera 4K
- BlackMagic Pocket Cinema Camera HD (original ver.)
- BlackMagic Micro Cinema Camera
- BlackMagic Micro Studio Camera 4K
- BlackMagic Studio Camera 4K
- BlackMagic Studio Camera

Compatible Lenses
- Canon EF100-400mm f/4.5-5.6L IS II USM
- Canon EF100-400mm f/4.5-5.6L IS USM (I)
- Canon EF100mm f/2.8L IS USM Macro*
- Canon EF135mm f/2L USM
- Canon EF16-35mm f/2.8L II USM*
- Canon EF17-35mm f/2.8L USM
- Canon EF17-40mm f/4L USM
- Canon EF200mm f/2.8L II USM
- Canon EF24-105mm f/4L IS USM (I)
- Canon EF24-70mm f/2.8L II USM*
- Canon EF28-135mm f/3.5-5.6 IS USM
- Canon EF28-70mm f/3.5-4.5 II
- Canon EF28-80mm f/3.5-5.6 III USM
- Canon EF300mm f/2.8L IS II USM*
- Canon EF300mm f/4L IS USM
- Canon EF400mm f/5.6L USM
- Canon EF40mm f/2.8 STM*
- Canon EF50mm f/1.2L USM
- Canon EF50mm f/1.4 USM
- Canon EF50mm f/1.8 II
- Canon EF50mm f/1.8 STM*
- Canon EF70-200mm f/2.8L IS II USM*
- Canon EF70-200mm f/4L IS II USM*
- Canon EF70-200mm f/4L USM
- Canon EF70-300mm f/4-5.6L IS USM
- Canon EF8-15mm f/4L USM Fisheye*
- Canon EF85mm f/1.2L II USM
- Sigma 135mm f/1.8 DG HSM Art 017*
- Sigma 18-35mm f/1.8 DC HSM Art 013
- Sigma 24-105mm f/4 DG HSM Art 013
- SIgma 24-35mm f/2 DG HSM Art 015
- Sigma 30mm f/1.4 DC HSM Art 013
- Sigma 35mm f/1.4 DG HSM Art 012*
- Sigma 50-100mm f/1.8 DC HSM Art 016*
- Sigma 50-500mm f/4.5-6.3 DG OS HSM
- Sigma 50mm f/1.4 DG HSM (not Art)
- Tamron 10-24mm f/3.5-4.5 VC HLD B023
- Tamron 18-250mm f/3.5-6.3 A18
- Tamron 18-270mm f/3.5-6.3 B003
- Tamron 24-70mm f/2.8 VC USD A007 (G1)
- Tamron 28-300mm f/3.5-6.3 A06
- Tamron 35-150mm f/2.8-4 VC OSD A043
- Tamron 70-200mm F/2.8 Di VC USD A009
- Tokina 11-16mm f/2.8 AT-X PRO (I)
- Zeiss 18mm f/3.5 ZE
- Canon EF-Extender (Teleconverter)
 
* = Smooth iris support

Incompatible Lenses
- Tamron 70-300mm F/4-5.6 VC USD A005

Limitations
- No Lens OIS/VC Support
   - Tamron SP 15-30/2.8 VC USD A012
   - Tamron 45mm F/1.8 VC USD F013
   - Tamron 150-600mm F/5-6.3 VC USD A011
- No AF Support
   - Tamron SP 17-50mm F/2.8VC B005
   - Tamron 28-300mm F/3.5-6.3 VC A20
   - Tokina Opera 50mm F/1.4
   - Sigma18-125mm F/3.5-5.6DC OS HSM
   - Canon EF100-400mm F/4.5-5.6L IS II USM
- No Iris Support without External Power Supply
   - Canon EF24-70mm F/2.8L USM (I)
   - Canon EF100mm F/2.8 USM Macro (non-L)
   - Tamron 18-270mm F/3.5-6.3 VC PZD B008

Unsupported List
- Standard M43 camera. When this Speed Booster® is used with other MFT camera, it may cause damage to the camera.
- EF-S lens. EF-S lenses require modification to fit or may remain incompatible even after modification.
- 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

Note :
- This Speed Booster is designed to cover a BMPCC4K image circle which is not big enough to cover a full-size 36mm x 24mm sensor.
- For use with fast lenses (faster than f/1.4), the pre-boost apertures will be displayed in the camera.
Slow lenses will report boosted apertures to the camera body but fast lenses will report pre-boost apertures. We won't show f/0.9 with a f/1.2 lens attached, but show f/1.2 instead.
Example:
a) EF 85/1.2L attached, camera display = f/1.2, physical aperture  (lens + Speed Booster combined) = f/0.85.
b) Sigma 18-35/1.8 attached, camera display = f/1.3, physical aperture (lens + Speed Booster combined) = f/1.3.
- External 5V power via micro USB port may be required (not included).
- A third party zoom lens may need to be registered with the Speed Booster/Smart Adapter first in order to detect its maximum aperture.
- Some improperly-made M42 screw mount adapters may short the electronic contacts of the Speed Booster and cause damage to the Speed Booster and/or camera body.
- Many manual focus lenses (e.g. OM 28/2.8, OM 50/1.8, Leica R 15/3.5) 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 on Speed BoosterTM are not covered by warranty.

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.