This Canon EF Lens to Micro Four Thirds Speed Booster S Version (MB_SPEF-m43-BM2) must use with active MFT mount carmeas, such as OMD, GH4 and BMPCC, but is not compatible with passive MFT mount cameras, e.g. BMCC 2.5K. Passive MFT camera users please choose another version called "Canon EF Lens to Micro Four Thirds Speed Booster (MB_SPEF-m43-BM1)". 

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• Increase maximum aperture by 1 stop. 
• Increase MTF.
• Makes lens 0.71x wider.
• Build-in electronics to control lens aperture.
• The lens aperture is set by the controls on the camera body.
• Powered by camera body. no external power source required. 
• High performance 32-bit processor and efficient switched-mode power supply.
• The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.
• Support O-M10, O-M1 and O-M5

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

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Supported

Not supported

Olympus E-M10, E-M1, E-M5 EF lenses Image stabilization (IS) lenses Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L) EXIF (focal length, aperture, zoom range) Distance and zoom display on camcorders (see note 1) 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)

External 5 Volt power supply (see note 6) Autofocus EF-S lenses (some EF-S lenses may need modification) Lens correction such as peripheral shading, CA and distortion Focus confirmation "chip" (e.g. Dandelion) M42 screw mount adapters (see note 4) Stacking non-Metabones/non-Conurus mount adapters on top (see note 5 and list of lenses which require modification below.) Lens: Tamron SP 17-50mm F/2.8 XR Di II VC

Note:

1. Requires lenses supporting distance information.
2. A third party zoom lens may need to be registered with the Speed Booster/Smart Adapter first in order to detect its maximum aperture. 
3. This Smart Adapter is designed to cover an 17.3mm x 13mm sensor.
4. Some improperly-made M42 screw mount adapters may short the electronic contacts of the Smart Adapter and cause damage to the Smart Adapter and/or camera body.
5. 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 Smart Adapter^. They need to be modified before they can be safely used on Smart Adapter. Check and make sure there are no rear protrusions from the adapter/lens combination before using on Smart Adapter. Scratches and damages caused by rear protrusions on Smart Adapter are not covered by warranty.
6. For those passive (without electronic pin or without power supply from the camcorder) MFT camcorders, Please choose normal version (Canon EF Lens to Micro Four Thirds Speed Booster - MB_SPEF-m43-BM1). This Speed Booster "S" version can NOT be powered by external third-party 5 Volt MicroUSB power supply.
    

7. For use with fast lenses (faster than f/1.8), 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/0.7 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/0.74.
   b) Sigma 18-35/1.8 attached, camera display = f/1.0, physical aperture (lens + Speed Booster combined) = f/1.0.

Difference between Normal version and S version of EF-MFT Speed Boosters:

Canon EF Lens to Micro Four Thirds Speed Booster  MB_SPEF-m43-BM1	Canon EF Lens to Micro Four Thirds Speed Booster S MB_SPEF-m43-BM2
Support external 5 Volt power supply ( can support BMCC) Can use jog-dail button to control aperture when using external power supply. Not support O-M10, O-M1 and O-M5 Support BMPCC and Panasonic GH4, GH3, GH2, and GH1	Support O-M10, O-M1 and O-M5, also Panasonic GH4, GH3, GH2, GH1 cameras and BMPCC without jog-dail button Not support external power supply ( Not support BMCC)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Select the correct EF-MFT Speed Booster fits for your camera:

 

List of lenses (have been tested by metabones) with support on EF-M43 Smart Adapter. (Lenses which have been tested with EF-E Smart Adapter may refer to EF-E Smart Adapter 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
Others Sigma 18-200mm3.5-6.3 Zeiss 35mm2

List of manual focus lenses which REQUIRE MODIFICATION to be used on Smart Adapter

Many manual focus lenses have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of Smart Adapter. They need to be modified before they can be safely used on Smart Adapter. Check and make sure there are no rear protrusions from the adapter/lens combination before using on Smart Adapter. 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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