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)

Not Supported

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.)

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.

# For Lens Compatability chart please refer to Matabones Web site.