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Metabones MB_SPEF-X-BT2 Canon EF to Fuji X-Mount T CINE Speed Booster ULTRA 0.71x

code: MB_SPEF-X-BT2
  • £683.31
  • RRP: £624.11
Status   |   Usually dispatched within 24 hours


  • Canon EF mount lens to Fujifilm X-mount camera
  • Autofocus. Phase-detection autofocus (PDAF) is supported no matter which AF lens is used. Adapters support PDAF by translating pertinent metadata about the optics between the lens interfaces. In this way, broad support of the widest range of lenses is made possible
  • Lens iris/aperture is set by the controls on the camera body
  • Fujifilm XF Teleconverters support
  • Optical image stabilization (IS) lens support
  • Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lens models
  • Focal length and aperture are adjusted in EXIF
  • Store EXIF data (lens name, focal length and maximum/minimum aperture) for one manual lens in the adapter
  • Parallax correction on the X-Pro series rangefinders is also supported
  • LED indicator shows communication status
  • Powered by camera body. With most lenses, no external power source required

Metabones MB_SPEF-X-BT2 (MB-SPEF-X-BT2, MB/SPEF-X-BT2, MB/SPEF/X/BT2, MBSPEFXBT2) Canon EF to Fuji X-Mount T CINE Speed Booster ULTRA 0.71x

Sharper corners, less distortion, reduced vignetting 

Optical design:  advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting.

Like the revolutionary original Metabones Speed Booster® announced in January 2013, the Speed Booster ULTRA has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless cameras with DX-sized sensors(APS-C), such as Sony E-mount and Fuji X-mount cameras, from 1.5x to 1.07x.  However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is well corrected for use with virtually all full-frame SLR lenses regardless of exit pupil distance. Thus, the Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon to produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively.  Similarly, high-speed fixed focal length lenses such as a 50mm f/1.2 will be transformed into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center all the way to the edges of the image.


Increase maximum aperture by 1 stop. (with a maximum output aperture of f/0.9).

Increase MTF.

Makes lens 0.71x wider.

Advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic in the USA (patent granted).


Patented positive-lock EF lens mount.

Flocking to reduce internal reflection.

Rubber gasket protects the X-mount connection from dust and moisture.

Aluminum alloy and brass construction with chromium plating.

Satin surface finish.

Detachable tripod foot compatible with Arca Swiss Style ball head, such as Markins and Photo Clam or attach to quick release plate by a 1/4"-20 screw.


1. EF-S lenses do not fit on Speed Booster®. Some EF-S lenses may be modified to fit, but do so at your own risk.

2. Third-party lenses designed for APS-C format do not have enough coverage when used in conjunction with Speed Booster®.

3. For use with fast lenses (faster than f/1.4), 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/0.9 with a f/1.2 lens attached, but show f/1.2 instead.


a) EF 85/1.2L attached, camera display = f/1.2, physical aperture (lens + Speed Booster® combined) = f/0.85.

b) Sigma 35/1.4 attached, camera display = f/1.0, physical aperture (lens + Speed Booster® combined) = f/1.0.

4. 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.

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 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.

  • Compatibility: Fujifilm X-A1, Fujifilm X-H1, Fujifilm X-Pro1, X-Pro2, Fujifilm X-T3, X-T4, Fujifilm X-T30, Fujifilm X-T100
  • Camera Mount: FUJIFILM X
  • Lens Mount: Canon EF
  • Magnification: 0.71x
  • Optical Design: 5 Elements in 4 Groups
  • Electronic Communication: Yes
  • Material: Aluminium alloy and brass construction with chromium plating
  • Tripod Mounting Thread: 1/4"-20 Female

In The Box

  • Metabones Canon EF to Fuji X-Mount T CINE Speed Booster ULTRA 0.71x
  • Tripod Foot
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