Features and Benefits		Limitations
Electronic Autofocus Phase-detection autofocus (PDAF) on supported camera bodies* Iris/aperture controlled by the camera body Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lenses Image stabilization (IS) lens support Support for cameras with in-body image stabilization (IBIS) 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 (requires lenses supporting distance information) Cinema EOS lens support (CN-E 18-80mm T4.4 L, CN10x25, etc.), including AF, auto iris and servo zoom  (may require external power) LED indicator shows communication status. Other The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads. Flocking to reduce internal reflection. Rubber gasket protects the MFT mount connection from dust and moisture. Compatible with all MFT mount cameras, including G9II, GH7, GH6, GH5, OM-1, OM-D, Blackmagic Cinema Camera, Blackmagic Pocket Cinema Camera and JVC GY-LS300.		AF may not work if the maximum aperture of the lens plus any EF Extender or other teleconverter attached is smaller than f/8. Some older Tamron lenses may have unsatisfactory AF accuracy. No support for Focus Stacking and Focus Bracketing. EF-mount lenses are not silent but may make audible click noises during autofocus operation and iris changes which may be picked up by the built-in microphone of the camera. An external microphone is recommended for video. Use of Canon Cinema lenses such as CN-E 18-80mm T4.4 L IS KAS S and CN 10x25 T2.95 for still photography is not supported. Iris changes are in 1/8 stop steps which may be noticeable in video recordings. Programmed exposure mode and shutter priority exposure mode should not be used for video. This limitation does not apply to Cinema EOS lenses which permit fine resolution iris control, such as CN-E 18-80mm T4.4 L IS KAS S and CN 10x25. No support for in-camera correction such as peripheral shading, CA and distortion

 

 *If C-AF and C-AF-TR becomes greyed out on OM System OM-1, try turning on the "Keystone Correction" option on the camera, and then turn it off.

Always Enhance and Never Degrade the Performance of the Attached Master Lens

Like the ULTRA series for Sony E-mount, the new Speed Booster ULTRA m43 uses an advanced 5-element 4-group optical design incorporating ultra-high index tantalum-based optical glass.  However, the new design is specifically optimized for the Micro Four Thirds sensor and filter stack, and as a result achieves an astonishing level of performance that sets a new standard for focal reducers.

Like the revolutionary original Metabones Speed Booster^® announced in January 2013, the Speed Booster ULTRA m43 has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless Micro Four Thirds mount cameras from 2.0x to 1.4x.  However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is almost perfectly corrected for use with all fullframe SLR lenses regardless of aperture.  The Speed Booster ULTRA m43 will also work extremely well with many DX and APS-C format lenses provided the image circle of the lens is large enough.  Optical performance of the new Speed Boosters is so good that the MTF of any lens attached to it will be improved.  Even the latest generation of ultra-high performance SLR lenses such as the Zeiss Otus series can be improved by adding a Speed Booster ULTRA m43. (More information can be found in the press release here and whitepaper here)

Select the correct EF-MFT Speed Booster for your camera

GH7, XL or ULTRA?

In a nutshell, we recommend XL for full frame lenses and ULTRA for DX/APS-C lenses. For the long story, read the 'limitations' column.

Compatible with OM SYSTEM

Our EF-MFT line-up has been refreshed to "Mark II" by redesigning to clear the faux-pentaprism of OM SYSTEM OM-1. For details, as well as additional benefits of "Mark II", read press release.

Product Video

Unsupported Lenses

Incompatible

• Tamron 70-300mm F/4-5.6 VC USD A005

No Lens OIS/VC Support

• Tamron SP 15-30/2.8 VC USD A012 
• Tamron 150-600mm F/5-6.3 VC USD A011 
• Tamron 28-300mm f/3.5-6.3 XR Di Macro A06

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

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

AF may not be accurate (note 2)

• Canon EF 50mm f/1.8 II 
• Canon EF 28-70mm f/3.5-4.5 II
• Sigma 50mm f/1.4 EX HSM
• Tamron 18-250mm f/3.5-6.3 Di II Macro A18
• Tamron 24-70mm f/2.8 VC USD A007
• Tamron 28-300mm f/3.5-6.3 XR Di Macro A06
• Tokina AT-X PRO 11-16mm f/2.8 DX (I)

Incompatible EF-S lens

• Canon EF-S 10-18mm f4.5-5.6 IS STM
• Canon EF-S 17-55mm f/2.8 IS USM *
• Canon EF-S 18-55mm f/3.5-5.6 IS II *
• Canon EF-S 18-135mm f/3.5-5.6 IS USM "Nano" *

Unsupported List 

• EF-S Lens
• Panasonic and Olympus/OM Tele-converter
• Lens correction such as peripheral shading, CA and distortion 
• Focus confirmation "chip" (e.g. Dandelion)
• M42 screw mount adapters _{(see note 3)}
• Stacking non-Metabones/non-Conurus mount adapters on top (see note 3 and list of lenses which require modification below.)

Notes:

Note(1) CN-E Compact-Servo lens with some of MFT cameras may require external power to autofocus.

Use of Canon Compact-Servo Cinema lenses such as CN-E 18-80mm T4.4 for still photography is not supported. (Functional, but slower than lenses designed for still photography.)

Note(2) Accurate only on newer cameras such as Panasonic G7, GX8 and GX80/85.

Note (3) Some improperly-made M42 screw mount adapters may short the electronic contacts of the Speed Booster/ Smart Adapter and cause damage to the adapter and/or camera body.

Manual Focus Lens Compatibility

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.

 

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Disclaimer: we are NOT licensed, approved or endorsed by Micro Four Thirds or Canon.

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