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Metabones Canon EF to E-Mount T Smart Adapter Mark IV - Black Matte

Abel Code: MB-EF-E-BT4
Mfr. Code: MB_EF-E-BT4
Ideal for adapting your Full Frame or APS-C format E-Mount camera to your Canon EF or EF-S Mount lenses. Not your standard adapter. This one has tons of features.
Key Highlights
  • E Mount Camera > EF Lens
  • Fits Canon EF/EF-S Lens
  • For Full Frame & APS-C cameras

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This Metabones Lens Adapter lets you use your Canon EF or EF-S mount lenses on your full frame or APS-C camera with an E-Mount. Multiple features and enhancements are included in this rugged and helpful adapter. 

This adapter is powered by your camera body. No external power source required.

It supports image stabilization (IS) lenses.

These are the Metabones exclusive features of this adapter:

  • If your lens supports optical image stabilization (OIS) AND your camera supports sensor-shift, in-body image stabilization (IBIS), then you have the choice to use one or to use both in harmony.
  • Smooth iris support with the latest Canon (009+), Tamron (SP series 2013+) and Sigma (2016+) lenses.
  • AF-C tracking during high speed drive at up to 10fps on Sony A9.
  • Custom function button (called Focus Hold button) assignable to more than 50 functions, such as Aperture Preview and Eye-AF, on A9, A7 series, A6500 and A6300.
  • Cinema EOS lens (CN-E) support, including power zoom, AF, and auto iris.
  • Detachable tripod foot, compatible with Arca Swiss, Markins and Photo Clam ball heads.

Electronic Features:

  • 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.)
  • Efficient switched-mode power supply.
  • 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 with Canon EF-S lenses and many third party DX lenses.

Optical / Mechanical Benefits:

  • Includes flocked interiorcoating on the inner opening to help prevent internal reflection when using a Tilt Shift (TS) lens. This is an enhancement from the old Mark IV (MB_EF-E-BM4).
  • Fits both EF and EF-S lenses.

NOTE: 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.

Autofocus Limitations per Manufacturer:

  • 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.)
  • On Sony A9, only phase-detection autofocus is supported. Contrast-detection autofocus does not work. 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.
  • 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 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.

Other Limitations per Manufacturer:

  • 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.
  • 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 Smart Adapter. Turn off the aftermarket battery grip or use a genuine Sony battery grip.

IMPORTANT NOTE: Some EF-mount lenses may make audible noises during iris changes and autofocus, which may be picked up by the built-in microphone of the camera during video recording. Use of an external microphone is advised. Some of the recently-introduced Canon-brand lenses are very quiet, however.

NOTE: Manufacturer states they are not licensed, approved or endorsed by Sony or Canon.

What's in the Box

  • Limited 1-Year Warranty
  • Tripod Food Hex Key
  • Rear Cap
  • Front Cap
  • Metabones Canon EF/EF-S Lens to Sony E Mount T Smart Adapter (Mark IV)


Key Highlights

  • E Mount Camera > EF Lens
  • Fits Canon EF/EF-S Lens
  • For Full Frame & APS-C cameras
  • Reduce int. reflection on Tilt Shift
  • Detachable tripod foot
  • Smooth Iris Support on select lenses
  • Fast contrast-detection AF

Lens Characteristics

Max Dimensions (Diameter x Length):
2.6" x 1.2"

Mount / Optical Lens Adapters

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


4.3 in
2.4 in
4.3 in
0.5 lb
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