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MTF Services Ltd B4 2/3" to Canon EF Adapter

BH #MTB4CANEF • MFR #MTB4CANEF
2 reviews
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MTF Services Ltd B4 2/3" to Canon EF Adapter
Key Features
  • Adapts B4 lenses to Canon EF
  • Multi Layer Coated Optics
  • Solid Aluminum Construction
  • Chrome Plated Canon EF Mount
The B4 2/3" to Canon EF Adapter from MTF Services Ltd enables the use of ENG style B4 2/3" lenses on cameras with the Canon EF mount. The adapter features multi layer coated optics, solid aluminum construction and a chrome plated EF mount. A lens support bridge for use with industry standard 15mm rod support systems is also included.
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MTF Services Ltd MTB4CANEF Overview

The B4 2/3" to Canon EF Adapter from MTF Services Ltd enables the use of ENG style B4 2/3" lenses on cameras with the Canon EF mount. The adapter features multi layer coated optics, solid aluminum construction and a chrome plated EF mount. A lens support bridge for use with industry standard 15mm rod support systems is also included.

Note:
In order to avoid vignetting, the B4 2/3" lens will need to have the 2x extender engaged and the camera's image sensor should be Super 35mm or smaller. HD lenses are recommended. Engaging the 2x extender also allows the adapter to optically correct for using your lens on a single sensor.
Adapts B4 2/3" lenses to Canon EF mount cameras
Multi layer coated optics and solid aluminum construction
Includes support bridge for use with 15mm rod support systems

MTF Services Ltd MTB4CANEF Specs

Camera Mount
Canon EF
Lens Mount
B4 Mount
Electronic Communication
No
Materials
Aluminum
Packaging Info
Package Weight
1.2 lb
Box Dimensions (LxWxH)
7.4 x 4.4 x 3"

MTF Services Ltd MTB4CANEF Reviews

Exceeded expectations

By walter
Rated 5 out of 5
Date: 2024-11-23

I purchased this to run an HD broadcast lens on my Full Frame, Canon C400. Been covering a lot more trials for Court TV and really needed the reach of a broadcast lens but didn't want to buy a whole new camera system just for that. I paired this with a Canon HJ17ex7.6b 2/3 broadcast lens. Like the description says, you have to use the doubler, but with the C400 in S35 image scan mode, it works great. I'm completely impressed with the quality from the converter. No notable vignetting besides what the lens usually has. Images are super sharp. Focus works just like it should. Lens remains parfocal using it through this adapter and no spherical aberrations are noticed, even when the lens is wide open. Oh and since the C400 is RF and this is an EF adapter, I'm adding in an additional EF to RF for my use case.

値段が高すぎる

By Hironori
Rated 4 out of 5
Date: 2018-11-06

EOS C300に付けて使用していますが、レンズ側は×2エクステンダーを入れないとケラれます。 またそれによりfが2stop落ちます。 解像感ですが、そもそも2/3インチのイメージサークルで設計されたレンズを無理矢理スーパー35に引き伸ばしさらにエクステンダーを入れているので解像感は落ちますし、特に周辺解像度が悪いように思えます。 最近のHJ14や4K対応のCJシリーズであれば良くなるかもしれません。 メリットとしては引きからヨリまでfドロップなしで使えることだと思いますので、EFマウントカメラでヨリ引きが多いスポーツなどを撮影する場合は適していると思います。 今となっては4Kカメラでセンサークロップモードを使えばこのような高価なアダプターは不要で、もっと安いただのマウント変換で事足ります。

See any errors on this page?

Will this adpater work on the new Red Kmodo which ...

Will this adpater work on the new Red Kmodo which comes with an Will this adapter work with the new Red Komodo which comes with a rf to ef adapter ?
Asked by: Patrick
The RED Komodo is not on the list of compatible pairings.
Answered by: Bruno
Date published: 2021-05-07

Will this adapter allow me to use B4 lenses on ...

Will this adapter allow me to use B4 lenses on BMD Studio Camera 6K without vignetting in Ultra HD? (MFT Sensor).
Asked by: Cesar
To have no vignetting with your lens when using the MTF Services Ltd B4 2/3" to Canon EF Adapter the B4 2/3" lens will need to have the 2x extender engaged and the camera's image sensor should be Super 35mm or smaller. HD lenses are recommended. Engaging the 2x extender also allows the adapter to optically correct for using your lens on a single sensor.
Answered by: Jonathan S
Date published: 2024-04-14

Can I use this to adapt my Fujinon 2/3 B4 lens to ...

Can I use this to adapt my Fujinon 2/3 B4 lens to my canon R5 along with an ef to rf adapter?
Asked by: Jaycinema
The MTF Services Ltd B4 2/3" to Canon EF Adapter can be used to mount B4 to EF and then to RF but you may still need additional teleconverters to eliminate seeing into the lens barrel itself. Often times, you will heavily degrade the image doing such and it becomes not worth it. This does not make it full frame but only s35, also to be noted.
Answered by: Jonathan S
Date published: 2023-10-09

question

does this adapter correct chromatic aberration from B4 lens ? since B4 lens is design for 3CCD chip
Asked by: John
The MTF Services Ltd B4 2/3 to Canon EF Adapter will optically correct for the different spectral alignments between three chip prism block sensors and single sensors as long as the 2X extender is engaged.
Answered by: Dennis A L.
Date published: 2019-04-23

question

What is the multiplication factor of the adapter by itself? I've heard that it's 1.35X, can anyone confirm this?
Asked by: Anonymous
Cheaper to buy the Kenko 1.4x Pro Teleconverter which will do the same job!
Answered by: Lee M.
Date published: 2018-08-28

Anyone happen to know if it's compatible with the ...

Anyone happen to know if it's compatible with the C200?
Asked by: Ermir
Yes, the MTF Services Ltd B4 2/3" to Canon EF Adapter is compatible with the Canon EOS C200.
Answered by: Paige K
Date published: 2023-10-12

i can't gather from your questions and answers so ...

i can't gather from your questions and answers so far: do i need to buy an additional 2x (ef-ef) teleconverter in order to use old SD b4 lenses without too much vignetting? i am confused because the product shown on the pictures already has an adapter with a lense which i assumed was the converter? tldr: my lens doesn't have a 2x extending-mode. and i want to shoot on a fullframe camera like 5d mII. what else do i need?
Asked by: antonia
You can use this w/o extender if the camera has super 16 mode.
Answered by: jay
Date published: 2022-02-02

question

In the video you state that you can use the adaptor in 1x and 2x range however on B&H you state that you must have the 2x engaged to avoid vignetting - which is correct or have I misunderstood something?
Asked by: Craig
Craig, I have this adapter (no longer use it though) and although you have the ability to toggle between 1x and 2x, 1x has serious vignetting and therefor you must only shoot in 2x.
Answered by: Anonymous
Date published: 2018-10-24
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