Metabones Canon EF to Micro Four Thirds T Speed Booster ULTRA 0.71x Adapter
A premium focal reducer for mounting Canon EF lenses to Micro Four Thirds cameras with a wider field of view, roughly one stop more light, and electronic lens support
The Metabones EF-MFT mount T Speed Booster ULTRA 0.71x is one of the most sought-after adapters for Micro Four Thirds shooters using Canon EF glass. It allows Canon EF-mount lenses to be used on Micro Four Thirds cameras, while the built-in focal reducing optics make the attached lens appear 0.71x wider and deliver about a 1-stop light gain. This model uses a 5-element / 4-group optical design, supports compatible autofocus, camera-controlled aperture, image stabilization, and EXIF transmission, and includes the detachable tripod foot design that Metabones made popular on these adapters.
Condition:
Excellent overall condition. The body presents very well with light cosmetic handling wear only. Mount surfaces look clean, contacts appear clean and intact, and the optical element looks clean in the photos with no obvious damage visible. The tripod foot is attached, the release button is present, and the adapter has clearly been kept in nice shape overall.
Includes:
- Metabones EF to Micro Four Thirds T Speed Booster ULTRA 0.71x adapter
- Front & Rear caps
Features:
- Canon EF lens to Micro Four Thirds camera adapter
- Metabones model MB_SPEF-M43-BT4
- 0.71x focal reduction
- Approx. 1-stop light increase
- 5 elements in 4 groups optical design
- Supports compatible autofocus
- Supports camera-controlled aperture
- Supports compatible lens image stabilization
- Supports EXIF data transmission
- Detachable Arca-Swiss compatible tripod foot
- Internal coating / flocking to reduce reflections
- Compatible with Micro Four Thirds bodies including Panasonic, Olympus/OM System, Blackmagic MFT cameras, and JVC GY-LS300, with lens and camera limitations noted by Metabones.
Why buy this one?
This is still one of the better ways to get more out of Canon EF glass on Micro Four Thirds. You get a wider effective field of view, more light, and a cleaner, more premium solution than the cheaper copy adapters. Great choice for Panasonic GH shooters, Olympus / OM System users, and Blackmagic MFT users who want to run Canon EF lenses with a more full-frame-like look.
Frequently Asked Questions:
Q: What mount conversion does this do?
A: It adapts Canon EF lenses to Micro Four Thirds cameras.
Q: What does 0.71x mean?
A: It reduces the focal length projection by 0.71x, giving a wider field of view and about a 1-stop brightness gain compared with a plain non-optical adapter.
Q: Does it support autofocus and aperture control?
A: Yes, with compatible lenses and cameras, it supports autofocus, aperture control, stabilization, and EXIF transfer, though Metabones notes lens-specific limitations.
Q: What is included?
A: The adapter and both caps only.
