Metabones Canon EF Lens to Sony E Mount T Smart Adapter (Mark IV) (MB-EF-E-BT4) | Conns Cameras | Ireland

Metabones Canon EF Lens to Sony E Mount T Smart Adapter (Mark IV) (MB-EF-E-BT4)


Metabones Canon EF Lens to Sony E Mount T Smart Adapter (Mark IV) (MB-EF-E-BT4) View Large Image


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Metabones Canon EF Lens to Sony E Mount T Smart Adapter (Mark IV) (MB-EF-E-BT4) €489.99 In Stock
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Features and benefits


  • Phase-detect autofocus support on A7RII and A7II.
  • Supports 5-axis in-body image stabilization of A7II and A7RII. (Distance information from lens required; 3-axis IBIS if lens does not transmit distance information.)
  • Powered by camera body. No external power source required.
  • Aperture control from camera body.
  • Wide open button (opposite of depth-of-field preview function) makes manual focusing easy and assignable to a custom function on A7 series.
  • High performance 32-bit processor and 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, zoom range)
  • Distance and zoom display on VG and FS series camcorders (lens with distance information support required).
  • Auto magnify (lens with distance information support required)
  • Auto "APS-C Size Capture" on full-frame cameras with Canon EF-S lenses and many third party DX lenses.


  • Fits both EF and EF-S lenses. (Vignetting at corners may occur with certain EF-S lenses because they are designed to cover a 1.6x crop image circle but Sony APS-C has a 1.5x crop factor.)
  • Flocking material coated inside the opening to reduce internal reflection.
  • The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads.



  • Fast phase-detect AF is available only on A7RII and A7II. On other Sony cameras, contrast-detect AF with an EF mount lens is disappointingly slow and inadequate for all but static subjects,
  • Even on A7RII and A7II, long telephoto lenses hunt more often and autofocus performance progressively deteriorates as focal length gets longer.
  • On A7RII, the AF points near the center always work well, but those on the edges and in the corners may lose effectiveness when a fast lens or a telephoto lens is used.
  • A7RII and A7II supports only contrast-detect AF during video recording. This means video AF speed may be unsatisfactory.
  • During movie capture, autofocus needs to be manually activiated by half-pressing the shutter release button if subject moves to a different distance. Since contrast-detect autofocus speed is slow, there may be visible disruption in the resulting footage.
  • With PXW-FS7, NEX-FS700 and NEX-FS100, autofocus works only in photo mode but disabled in movie capture mode.
  • Continuous AF is not supported. (Does not work with contrast-detect AF and may have unsatisfactory performance with phase-detect AF of A7RII and A7II.)
  • Eye AF is not supported.
  • DMF mode (direct manual focus) is not supported.
  • 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 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 NEX. Typical problems of this kind that we have seen 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.


  • No support for lens corrections such as peripheral shading, CA and distortion.
  • The EF-mount lens 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. Use of an external microphone is advised.
  • Early Tamron VC lenses such as the 17-50/2.8 B005 may not be able to freely switch between OIS and IBIS because they may not report IS activity status. The latest generation Tamron VC lenses 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 Smart Adapter. Turn off the aftermarket battery grip or use a genuine Sony battery grip.

Tested Camera Bodies:

  • A7SII, A7RII, A7II, A7S, A7R, A7
  • A6300, A6000
  • 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 chart

Phase-detect AF on A7RII, A7II, A6300 and slow contrast-detect AF on other cameras Tested by the community on A7RII, thanks!

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-S 17-55mm f/2.8 IS USM
Canon EF-S 18-55mm f/3.5-5.6 IS II
Canon EF 20-35mm f/3.5-4.5 USM
Canon EF 24mm f/1.4L USM
Canon EF 24-70mm f/2.8L II 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 50mm f/1.8 II
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 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 135mm f/2L 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 Extender 1.4x III
Canon EF Extender 2x II
Sigma 18-35mm f/1.8 DC Art
Sigma 18-125mm f/3.8-5.6 DC OS HSM
Sigma 24-105mm f/4 DG OS Art
Sigma 50mm f/1.4 DG HSM
Tamron SP 15-30mm f/2.8
Tamron 16-300mm f/3.5-6.3
Tamron 18-200mm f/3.5-6.3
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
Tokina 10-17mm f/3.5-4.5 DX
Tokina 11-16mm f/2.8 DX II

Canon EF 14mm f/2.8L II USM
Canon EF 24-70mm 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/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 only, cannot CDAF

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
1st generation Tamron VC lenses such as Tamron SP 17-50mm F/2.8 XR Di II VC B005 and Tamron 28-300mm f/3.5-6.3 VC A20

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)


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