Metabones Canon EF to Micro FourThirds T Speed Booster ULTRA 0.71x (Black Matt)

Metabones Metabones Canon EF Lens to MFT T SPEED BOOSTER Ultra 0.71X

Optical

• Increase maximum aperture by 1 stop
• Increase MTF of any lens attached
• Makes lens 0.71x wider
• Patented 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass by Caldwell Photographic in the USA

Electronic

• Autofocus
• Can be powered either by camera body or by third-party external 5V power source (not included)
• Iris/aperture controlled by the camera body
• Image stabilization (IS) lens support
• 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 (requires lenses supporting distance information)

Other

• Detachable tripod foot compatible with Arca Swiss, Markins and Photo Clam ball heads.
• Flocking material coating to reduce the internal reflection.

• EF-S lenses require modification to fit (but third party DX lenses can be used without modification)
• No video AF for Olympus
• AFC (continuous AF) and AFF (flexible AF) modes are not supported
• Panasonic video AF may hunt more than a native lens
• No support for in-camera correction such as peripheral shading, CA and distortion
• Designed to cover a 23mm image circle but not enough to cover Super35 so JVC GY-LS300 needs to have VSM configured to 86% (UHD)

Limitations

• EF-S lenses require modification to fit (but third party DX lenses can be used without modification)
• No autofocus support for JVC and Olympus
• AFC (continuous AF) and AFF (flexible AF) modes are not supported
• No 24p video AF
• Video AF may hunt more than a native lens
• No support for in-camera correction such as peripheral shading, CA and distortion
• Designed to cover an 17.3mm × 13mm sensor but not enough to cover Super35 so JVC GY-LS300 needs to have VSM configured to 80%

Autofocus Lens Compatibility List

Accurate

Canon EF20-35mm f/3.5-4.5 USM
Canon EF24-105mm f/4L IS USM
Canon EF35-80mm f/4-5.6
Canon EF40mm f/2.8 STM
Canon EF50mm f/1.2L USM
Canon EF50mm f/1.4 USM
Canon EF70-200mm f/2.8L IS II USM
Canon EF70-300mm f/4-5.6L IS USM
Canon EF85mm f/1.2L II USM
Canon EF100mm f/2.8 USM macro
Sigma 18-35mm f/1.8 DC Art
Sigma 18-125mm f/3.8-5.6 DC HSM
Tamron SP 24-70mm f/2.8 Di VC USD A007
Tamron SP 70-200mm f/2.8 Di VC USD A009
Tokina AT-X PRO 11-16mm f/2.8 DXII

Accurate only on newer cameras such as Panasonic G7

Canon EF70-200mm f/4L USM
Canon EF135mm f/2L USM
Canon EF200mm f/2.8L II USM

Inaccurate

Canon EF50mm f/1.8 II
Sigma 50mm f/1.4 EX HSM

Manual focus only

Contax N lenses modified by Conurus
Tamron SP 17-50mm f/2.8 VC B005
Zeiss ZE lenses

Manual Focus Lens Compatibility

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.
Focus confirmation »chips« such as Dandelion are incompatible.

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 Booster.

They need to be modified before they can be safely used on Speed Booster. 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 Booster are not covered by warranty.

List of manual focus lenses which require modification to be used on Speed Booster

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.