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Metabones MB_EF-E-BT4 Canon EF Lens to Sony E Mount T Smart Adapter Mark IV

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Metabones MB_EF-E-BT4 (MB EF E BT4, MBEFEBT4, MB/EF/E/BT4, mb_ef-e-bt4) Canon EF Lens to Sony E Mount T Smart Adapter (Mark IV)

Key Features

Features and benefits  


Phase-detect autofocus support on A7RII.

Supports 5-axis in-body image stabilization of A7II and A7RII,

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 for certain EF-S lenses because they are designed to cover a 1.6x crop image circle but Sony NEX has a 1.5x crop sensor.)

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. 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, 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 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.)

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.

Enhancement on new MARK IV (MB_EF-E-BT4)  vs. old MARK IV (MB_EF-E-BM4):


The inner opening is lined with flocking material coating. This will further reduce internal reflection when a tilt-shift (TS) lens is used.

Tested Camera Bodies:

A7RII, A7II, A7S, A7R, A7





NEX-7, NEX-6, NEX-5R, NEX-5N, NEX-5, NEX-C3, NEX-3



EF lenses (see below for list of tested lenses)

EF-S lenses (see note 1)

Image stabilization (IS)

Electronic manual focusing (e.g. EF 85/1.2L II and discontinued EF 50/1.0L)

EXIF (focal length, aperture, zoom range)

P, A, S, M exposure modes

Autofocus (see autofocus support section below)

Distance and zoom display on VG and FS series camcorders (see note 3)

Auto magnify (see note 2)

Contax N mount lenses modified to Canon EF by Conurus

Contax 645 NAM-1 adapter modified to Canon EF by Conurus

Sigma, Tamron and Tokina lenses in Canon EF mount (see note 3)

Not Supported

Lens correction such as peripheral shading, CA and distortion

Focus confirmation "chip" (e.g. Dandelion)

Stacking another lens mount adapter on top (see note 4)

Notes Vignetting at corners may occur for certain EF-S lenses because they are designed to cover a 1.6x crop image circle but Sony NEX has a 1.5x crop sensor.

Requires lenses supporting distance information.

A third party zoom lens may need to be registered with the Smart Adapter first in order to detect its maximum aperture. Autofocus is disabled for most third-party lenses.

For example, some improperly-made M42 screw mount adapters may cause a short-circuit with the electronic contacts of the Smart Adapter and cause damage to the Smart Adapter and/or camera body.

Tested Camera Bodies

A7 (Mark IV supports auto "APS-C Size Capture" with EF-S lens)

A7R (Mark IV supports auto "APS-C Size Capture" with EF-S lens)

NEX-FS700 (autofocus works only in photo mode, but is disabled in movie capture mode)

NEX-FS100 (autofocus works only in photo mode, but is disabled in movie capture mode)


NEX-VG900 (Mark IV supports auto "APS-C Size Capture" with EF-S lens)












Tested Lenses (The following lenses have been tested for autofocus operation. Minimum firmware version required shown in parentheses).

Canon EF primes

EF 14/2.8L II USM

EF 24/1.4L II USM

EF 24/2.8 IS USM

EF 35/1.4L USM (Ver.19)

EF 50/1.2L USM

EF 85/1.2L II USM

EF 85/1.8 USM (Ver.18)

EF 100/2.8 USM macro (Ver.17)

EF 135/2L USM (Ver.17)

EF 200/2.8L II USM (Ver.17)

EF 300/2.8L IS USM

Extender EF 1.4x III

Extender EF 2x (mark I)

Canon EF zooms

EF 8-15/4L USM fisheye

EF 17-40/4L USM

EF 20-35/2.8L (Ver.18)

EF 22-55/4-5.6 USM

EF 24-70/2.8L USM II

EF 28-80/3.5-5.6 II (Ver.18)

EF 28-90/4-5.6 III

EF 35-350/3.5-5.6L (Ver.18)

EF 70-200/2.8L IS USM II

EF 70-200/4L USM

EF 70-200/4L IS USM

EF 70-300/4-5.6L IS USM

EF 70-300/4-5.6 IS USM

EF 100-300/5.6 (non-L, not USM, push-pull zoom) (Ver.18)

EF 100-400/4.5-5.6L IS USM

Canon EF-S

EF-S 10-22/3.5-4.5 USM

EF-S 17-55/2.8 IS USM

EF-S 17-85/4-5.6 IS USM

EF-S 18-55/3.5-5.6

EF-S 18-55/3.5-5.6 IS

EF-S 18-135/3.5-5.6 IS

EF-S 60/2.8 macro USM

Sigma DC

17-70/2.8-4 DC OS HSM (Ver.15)

30/1.4 DC HSM old version (Ver.18)


SP 24-70/2.8 Di VC USD A007 (Ver.15)

SP 70-200/2.8 Di VC USD A009 (Ver.31)

Tokina (full frame)

28-80/3.5-5.6 (Ver.18)

Tokina DX

AT-X PRO SD 11-16/2.8 (IF) DX (Ver.15)

Manual Focus Only

The following lenses have been tested with previous firmware versions with manual focus, aperture control, image stabilization (if applicable) and EXIF support. Autofocus is supported only for those lenses marked with an asterisk (*) on NEX-5R/6

Canon EF primes

EF 14/2.8L (mark I)

EF 20/2.8 USM*

EF 24/1.4L USM (mark I)

EF 24/2.8 (old version, non-IS)

TS-E 24/3.5L

TS-E 45/2.8

EF 50/1.4 USM

EF 50/1.8 II

MP-E 65/2.8 macro

EF 85/1.2L (mark I)

EF 400/5.6L USM

Canon EF zooms

EF 24-70/2.8L (mark I)

EF 24-105/4L IS USM*

EF 28-70/3.5-4.5 II

EF 35-80/4-5.6

Contax N modified by Conurus

Vario-Sonnar 17-35/2.8

Vario-Sonnar 24-85/3.5-4.5

Vario-Sonnar 28-80/3.5-5.6

Planar 50/1.4

Planar 85/1.4

Makro-Sonnar 100/2.8 (Ver.21)

NAM-1 adapter

Sigma (full frame)

24-70/2.8 EX HSM

24-70/2.8 EX DG HSM

50/1.4 DG HSM (Ver.17)*

50/2.8 DG Macro

70-200/2.8 EX DG Macro HSM


Sigma DC

12-24/4.5-5.6 EX ASPH

17-35/2.8-4 EX HSM ASPH

18-125/3.5-5.6 DC OS HSM

30/1.4 EX DC HSM new version (Ver.17)


18-270/4.5-6.3 VC

SP 28-75/2.8

SP 70-200/2.8 Di LD A001


AT-X PRO 28-70/2.8

Zeiss ZE

This Smart Adapter is also compatible with fully manual lenses which have no electrical contacts.


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Standard UK Mainland Delivery    

We offer a standard mainland UK Delivery charge of £6.25 plus VAT on all orders (unless otherwise specified)

Items are estimated to arrive between 1-2 working days, subject to stock availability.

We also offer a Next Day Delivery £7.50 + vat and a Saturday Delivery option £25.00 + vat

Next day delivery - Option available if you order before 2.00pm 

European Delivery Service

DigiBroadcast can ship any item within Europe. Delivery charges will apply and are dependent on the size, weight and destination of the products you have ordered, and the area zone it is allocated to. 

All European deliveries are estimated to arrive between 1-3 working days, subject to stock availability, and prices are dependent on the European zone your country is allocated to.


Offshore & Overseas Delivery Service                                        

DigiBroadcast can ship any item worldwide. Delivery charges will apply and are dependent on the size, weight and destination of the products you have ordered, and the area zone it is allocated to.

All International deliveries are estimated to arrive between 2-5 working days, subject to stock availability,and shipping prices are dependent on the International zone your country is allocated to.

You will be responsible for any customs or import duties levied once the goods reach your country.   


IMPORTANT NOTES REGARDING VAT AND EU VAT                                      

If you are an EU registered business, with a valid VAT number, then you do not have to pay VAT.

You can enter your VAT registration number on the check out page, after you have selected your payment method.

Returns Policy                                               

This web site is intended for professional users. Customers must satisfy themselves that a product is suitable before making a purchase. Items sold online are sold on a firm sale basis and are not returnable. Items sold as new that within one year of the date of sale exhibit problems which can be attributed to manufacturing faults will be repaired or replaced. The decision to repair or replace will be at the discretion of Digibroadcast Co Ltd.                                                                                        

As part of our policy, items must be returned as new within 7 working days of delivery and with all the original packaging intact and product tags attached.                                            

Please notify us of your intention to return in writing at within 7 days of receiving your delivery.         

Returns Policy  for USED products                                                                               

Problems that can be attributed to fair wear and tear, misuse, exposure to contaminants including water or impact damage will be chargeable repairs.

"You" the customer within 7 days must notify us if you wish to return your purchased products to be able to asses, verify and fix any disputes with the purchase.                                           

Customers wishing to return items to Digibroadcast Co Ltd. must contact us to obtain a returned material number (RMA) before shipping the item. When contacting us please say that you want to make a return and have your invoice number ready to quote.                                           

Items returned to Digibroadcast Co Ltd without prior agreement will be returned to the customer. Digibroadcast Co Ltd accepts no liability for financial losses incurred by customers who have submitted unauthorised returns.                                

For some products the manufacturer offers the facility to register the product and obtain an enhanced warranty. Customers are strongly urged to register such products immediately. Digibroadcast co ltd regret that unregistered customers will not be able to benefit from the additional benefits.                                           


Unwanted Product Returns within 14 days                                        

"You" the customer within 7 days must notify us if you wish to return your purchased products. After 7 days, unwanted goods will only be accepted at Digibroadcast Co Ltd discretion and will be subject to a 25% restocking charge.                                           

The unwanted product must be returned in its original and undamaged packaging with all the accessories. Returns must be made within a reasonable period - maximum of 28 days from the day you receive the product.                                      

If the product is not returned in its original packaging, is damaged or has any accessories missing, we reserve the right to refuse a refund or charge for the missing accessories.                                       

We will not refund the delivery charge and you will be liable for the delivery charge when returning the product. Follow our Return Procedure to return the product.                                               

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