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Metabones T CINE Speed Booster ULTRA 0.71x (5th Generation) - Canon EF to Sony E-Mount Adapter

Abel Code: MB-SPEF-E-BT3
Mfr. Code: MB-SPEF-E-BT3
In Stock
Available In Store | NY
Adapts Canon EF Mount to Sony E-Mount with a magnification of 0.71x, and reduces the crop factor of mirrorless cameras with DX-sized sensors from 1.5x to 1.07x.
Key Highlights
  • Canon EF to Sony E-Mount Adapter
  • 0.71x magnification
  • Reduces crop factor 1.5x to 1.07x


The Metabones T CINE Speed Booster ULTRA 0.71x (5th Generation) - Canon EF to Sony E-Mount Adapter features a new optical design with advanced 5 element/4 group configuration incorporating ultra-high index, tantalum-based optical glass to achieve exceptional performance with improved corner sharpness and distortion, and reduced vignetting.

The Speed Booster ULTRA has a magnification of 0.71x, effectively reducing the crop factor of mirrorless cameras with DX-sized sensors (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 is well corrected for use with virtually all full frame SLR lenses, regardless of exit pupil distance.

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.

NOTE: Full-frame lens required. EF-S/DX/DC/Di II lenses are NOT supported. Speed Booster ULTRA is designed to cover an APS-C image circle which is not big enough to cover a full-size 36mm x 24mm sensor. On a full frame camera body (A7 series, NEX-VG900) the camera needs to have "APS-C/Super 35mm" set to either "Auto" or "On". 


  • Optical/Mechanical:
    • Optical glass by Caldwell Photographic (USA)
    • Increases maximum aperture by 1 stop
    • Increases MTF
    • Makes lens 0.71x wider
    • Felt material flocked inside to reduce internal reflection
    • New positive-lock EF lens mount
    • Store EXIF data (lens name, focal length and maximum/minimum aperture) for up to (2) manual lenses in the adapter
    • If your lens supports optical image stabilization (OIS) and your camera supports sensor-shift, in-body image stabilization (IBIS), the choice is yours on which one to use, or have both of them work in concert
    • Smooth iris support with the latest Canon (2009+), Tamron (SP series 2013+) and Sigma (2016+) lenses
    • Custom function button (Focus Hold button) assignable to more than (50) functions, such as Aperture Preview and Eye-AF, on A9, A7 series, A6500 and A6300
    • Dedicated switch controls in-body image stabilization (IBIS) on Sony cameras eqipped with SteadyShot INSIDE
    • Compatible with Sony FS7 Mark II camera
    • Cinema EOS lens (CN-E) support, including power zoom, AF and auto iris
    • Rubber gasket protects E-mount connection from dust and moisture
    • Detachable tripod foot, compatible with Arca Swiss, Markins and Photo Clam ball heads
  • Electronic:
    • AF-C tracking during high speed drive at up to 10fps on Sony A9 (NOT applicable to A7R Mark III or A7 Mark III)
    • Fast contrast-detection AF on all E-mount cameras (except AF-S/DMF with Sony A9)
    • Pure phase-detection autofocus support on A9, A7RII, A7II, A6500 and A6300 (the fastest)
    • Supports 5-axis, in-body image stabilization of A7II, A7RII and A7SII (Distance information from lens required; 3-axis IBIS if lens does not transmit distance information)
    • Powered by camera body; no external power source required
    • LED indicator shows operation mode, OIS (optical image stabilization) activity and communication status
    • Efficient switched-mode power supply
    • Supports image stabilization (IS) lenses
    • Supports electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)
    • EXIF support (focal length, aperture, lens name)
    • Distance and zoom display on VG and FS series camcorders, A9, A7 series, A6500 and A6300 (lens with distance information support required)
    • Auto magnify (lens with distance information support required)
    • Auto "APS-C Size Capture" on full-frame cameras
  • Autofocus:
    • AF-C is supported on A9, A7RII, A7II, A6500 and A6300 only, and only in Green mode
    • Continuous video AF is functional in Advanced mode, but performance may be unsatisfactory
    • On Sony A9, only phase-detection autofocus is supported (contrast-detection autofocus not available); see firmware release notes for details
    • AF may not work if the maximum aperture of the lens plus any EF Extender or other teleconverter attached is smaller than f/8 before boost or smaller than f/5.6 after boost
    • The first two autofocus attempts are used to calibrate the lens and as a result may not lock successfully on the target; half-press the shutter release button again and autofocus will lock successfully
    • Autofocus may have difficultly locking onto subjects which are very close to the nearest focusing distance of the lens
    • Autofocus accuracy depends heavily on the design and working condition of the lens; lenses with hidden problems which may not be apparent on Canon DSLRs will lead to inaccurate and unreliable autofocus on Sony
      • Typical problems of this kind include an unsmooth/erratic autofocus mechanism (e.g. getting stuck intermittently at a certain focusing distance), a faulty/worn-out distance encoder or other faulty/worn-out internal sensors
  • Other:
    • No support for lens corrections such as peripheral shading, CA and distortion
    • Use of Canon 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)
    • Some EF-mount lenses may make audible noises during iris changes and autofocus, wich may be picked up by the built-in microphone of the camera during video recording; ese of an external microphone is advised (some of the recently-introduced Canon-brand lenses are very quiet, however)
    • Early Tamron VC lenses such as the AF 28-300/3.5-6.3 XR Di VC LD Aspherical [IF] Macro (model A20), AF 18-270/3.5-6.3 Di II VC LD Aspherical [IF] MACRO (model B003), SP AF 17-50mm F/2.8 XR Di II VC LD Aspherical [IF] (model B005) may not be able to freely switch between OIS and IBIS because they may not report IS activity status; later Tamron VC lenses equipped with USD or PZD focus motors are fine
    • Some aftermarket battery grips may cause the aperture to change erraneously (this is a bug of the aftermarket battery grip but NOT arising from the Metabones Speed Booster; turn off the aftermarket battery grip or use a genuine Sony battery grip)

Tested Camera Bodies:

  • A9, A7SII, A7RII, A7II, A7S, A7R, A7
  • A6500, A6300, A6000, A5000
  • PXW-FS7M2, PXW-FS5, PXW-FS7, NEX-FS700, NEX-FS100
  • NEX-EA50, NEX-VG900, NEX-VG30, NEX-VG20, NEX-VG10
  • NEX-7, NEX-6, NEX-5R, NEX-5N, NEX-5, NEX-C3, NEX-3

Lens Compatibility:

  • Fast AF on all E-mount cameras (phase detection AF only with Sony A9):
    • Canon EF 8-15mm f/4L USM Fisheye*
    • Canon EF 11-24mm f/4L USM
    • Canon EF 16-35mm f/2.8L USM
    • Canon EF 16-35mm f/4L IS USM
    • Canon EF 20-35mm f/3.5-4.5 USM
    • Canon EF 24mm f/1.4L USM
    • Canon EF 24-105mm f/4L IS USM
    • Canon EF 28-80mm f/3.5-5.6 II
    • Canon EF 40mm f/2.8 STM*
    • Canon EF 50mm f/1.2L USM
    • Canon EF 50mm f/1.4 USM
    • Canon EF 50mm f/1.8 STM*
    • Canon EF 70-200mm f/2.8L IS II USM*
    • Canon EF 70-200mm f/4L IS USM
    • Canon EF 70-200mm f/4L 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 Macro IS 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 180mm f/3.5L Macro USM
    • Canon EF 200mm f/2.8L II USM
    • Canon EF 300mm f/4L IS USM
    • Canon EF 400mm f/5.6L USM
    • Canon EF Extender 1.4x III
    • Canon EF Extender 2x II
    • Sigma 24-105mm f/4 DG OS Art
    • Sigma 50mm f/1.4 DG HSM
    • Tamron SP 15-30mm f/2.8 VC USD A012*
    • Tamron SP 24-70mm f/2.8 Di VC USD A007
    • Tamron SP 45mm f/1.8 Di VC USD F013*
    • Tamron SP 70-200mm f/2.8 Di VC USD A009*
    • Tamron 70-300mm f/4-5.6
    • Tamron SP 90mm f/2.8 Macro
    • Tamron 150-600mm f/5-6.3 VC USD A011*
  • Tested by the Community:
    • Canon EF 14mm f/2.8L II USM
    • Canon EF 24-70mm f/4L IS USM
    • Canon EF 28-300mm f/3.5-5.6L USM
    • Canon EF 35mm f/1.4L II USM
    • Canon EF 35mm f/2L IS USM
    • Canon EF 35-350mm f/3.5-5.6L USM
    • Canon EF 70-200mm f/2.8L IS USM (Mark I)
    • Canon EF 70-200mm f/2.8L USM (non-IS)
    • Canon EF 75-300mm f/4-5.6 IS USM
    • Canon EF 85mm f/1.8 USM
    • Canon EF 400mm f/2.8L IS USM (Mark I)
    • Canon EF 400mm f/5.6L USM
    • Canon EF 500mm f/4L IS USM (Mark I)
    • Sigma 12-24mm f/4.5-5.6 (Ver I)
    • Sigma 20mm f/1.4 DG HSM Art
    • Sigma 24mm f/1.4 DG HSM Art
    • Sigma 35mm f/1.4 DG HSM Art
    • Sigma 50mm f/1.4 Art
    • Sigma 50-500mm f/4-6.3 OS HSM
    • Sigma 70-200mm F2.8 APO EX DG OS HSM
    • Sigma 85mm f/1.4 EX DG HSM
    • Sigma 150mm f/2.8 Macro
    • Sigma 150-600mm f/5-6.3 OS HSM Contemporary
  • Phase-detect AF on A9, A7RII, A7II, A6500 and A6300 only; unable to contrast-detect AF accurately (if at all):
    • Canon EF 24-70mm f/2.8L II USM
    • Canon EF 28-70mm f/3.5-4.5 II
    • Canon EF 35mm f/1.4L USM
    • Canon EF 50mm f/1.8 II
    • Canon EF 100mm f/2.8 Macro USM
    • Canon EF 135mm f/2L USM
    • Contax N Vario Sonnar 17-35mm f/2.8
    • Contax N Planar 50mm f/1.4
    • Contax N Vario Sonnar 70-200mm f/3.5-4.5
    • Contax N Planar 85mm f/1.4
  • Manual Focus Only:
    • Samyang 35/1.4
    • Zeiss CP.2 25mm/T2.9
    • Zeiss CP.2 100mm/T2.1
    • Zeiss ZE Distagon 15/2.8
    • Zeiss ZE Distagon 21/2.8
    • Zeiss ZE Distagon 35/2
    • Zeiss ZE Makro-Planar 50/2
    • Zeiss ZE Makro-Planar 100/2
  • Not Supported:
    • Focus confirmation "chip" (e.g., Dandelion)
    • Tamron 28-300/3.5-6.3 XR Di VC LD Aspherical [IF] MACRO A20
      • Unstable due to unusually high current requirement

*NOTE: Lenses marked with an asterisk support smooth iris.


What's in the Box

  • Metabones T CINE Speed Booster ULTRA 0.71x (5th Generation) - Canon EF to Sony E-Mount Adapter


Key Highlights

  • Canon EF to Sony E-Mount Adapter
  • 0.71x magnification
  • Reduces crop factor 1.5x to 1.07x
  • Increases maximum aperture by 1 stop

Lens Characteristics

Max Aperture F-stop:
f/0.9 - when using f/1.2 lens
Elements & Groups:
5 elements in 4 groups
Magnification Ratio:

Mount / Optical Lens Adapters

Adapter Mount Side B (Camera):
Adapter Mount Side A (Lens):
Adapter Type:
Optical Adapter
Mount Adapter


4.7 in
2.4 in
4.8 in
1 lb
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