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


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This Canon EF to Micro Four Thirds T Speed Booster ULTRA 0.71x is designed specifically to mount a full-frame Canon EF lens to a Micro Four Thirds camera – accommodating a Micro Four Thirds sensor and filter stack. It offers near-perfect clarity through any full-frame SLR lens. This adapter can also be fully utilized by most DX and APS-C lenses with the correct size image circle – supporting 16:9 video with DX lenses. Additionally, its magnification of 0.71x compensates for the 2.0x crop factor of mirrorless Micro Four Thirds cameras, converting it to 1.4x.

This Speed Booster ULTRA Micro Four Thirds adapter opens up aperture by 1-stop for an overall, larger intake of light. Meaning a Micro Four Thirds camera can capture a larger image with the attachment of a full-frame lens. These images will hold sharp, crystal clear clarity as light is channelled perfectly through the five optical elements divided into four groups. The lens construction, which consists of ultra-high index tantalum-based optical glass, will improve the MTF of any attached lens.

This Speed Booster ULTRA Micro Four Thirds adapter is made of aluminium alloy with precision-machined brass connection points and chromium plating for long-lasting durability whilst only weighing a mere 172g. Its strong leaf-spring structure will cling to your lens tightly, virtually eliminating the potential for wear, focus error and optical alignment issues. Lenses are easily switched out by the simple push of a button. With the included detachable foot, this adapter can mount to a tripod, even those with Arca-Swiss, Markins and Photo Clam ball heads. It also features a 3/8” threading.

This adapter connects to lenses electronically, for autofocus, aperture, image stabilization, distance display and zoom display support. Communicated EXIF data such as the lens identification, focal length and aperture of each attached lens is stored for quick collaboration the next time it’s attached.

Discover the advantages of using a full frame lens on a Micro Four Thirds camera and save yourself a lot of money by ordering this Metabones Canon EF to Micro FourThirds T Speed Booster ULTRA  0.71x adapter.


Camera Mount Micro Four Thirds
Colour Black Satin exterior; Black Matte interior
Magnification 0.71x
Crop Factor for Full Micro Four Thirds format 1.4x
Lens Elements/Groups 5/4
Lens Compatibility Canon EF-mount lens to Micro Four Thirds-mount camera
Special Features IS support and in-camera aperture selection.
Tripod Mount Robust removable type with Arca-Swiss, Markins and Photo Clam compatibility


The following table lists lenses which has been tested. Other lenses not listed here typically works well, too.

Accurate Tested by the community Accurate only on newer cameras such as Panasonic G7 and GX8
Canon EF 8-15mm f/4L USM Fisheye
Canon EF 20-35mm f/3.5-4.5 USM
Canon EF 24-105mm f/4L IS USM
Canon EF 28-80mm f/3.5-5.6 II
Canon EF 35-80mm f/4-5.6
Canon EF 40mm f/2.8 STM
Canon EF 50mm f/1.2L USM
Canon EF 50mm f/1.4 USM
Canon EF 70-200mm f/2.8L IS II USM
Canon EF 70-300mm f/4-5.6L IS USM
Canon EF 85mm f/1.2L II USM
Canon EF 100mm f/2.8L IS Macro USM
Canon 50mmEF 100mm f/2.8 Macro USM
Canon EF 100-400mm f/4.5-5.6L IS USM
Canon EF 100-400mm f/4.5-5.6L IS II USM
Canon EF Extender 1.4x III
Canon EF Extender 2x
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
Canon EF 70-200mm f/2.8L IS USM (Mark I)
Canon EF 85mm f/1.2L USM (Mark I)
Canon EF 200mm f/2.0L IS USM
Canon EF 300mm f/2.8L IS USM (Mark I)
Canon EF 400/2.8L IS USM (Mark I)
Canon EF 70-200mm f/4L USM (non-IS)
Canon EF 135mm f/2L USM
Canon EF 200mm f/2.8L II USM
Canon EF 300mm f/4L IS USM
Canon EF 50mm f/1.8 II
Sigma 50mm f/1.4 EX HSM
Tamron 28-300mm f/3.5-6.3 XR Di VC A20
Manual focus only Not supported
Contax N lenses modified by Conurus
Tamron SP 17-50mm f/2.8 VC B005
Zeiss ZE lenses
Focus confirmation “chips”


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.


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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