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Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera

BH #MEBSEFEFRBT1 • MFR #MBSPEF-EFR-BT1
Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera
Key Features
  • Canon EF Lens to Canon RF Body
  • Full-Frame Lens to RF Camera Body
  • For UHD 4K Video Capture
  • 0.71x UHD 4K Crop Factor Compensation
This T Speed Booster Ultra 0.71x Adapter from Metabones allows a full-frame Canon EF-mount lens to be used on a Canon RF-mount camera. While providing a one-stop increase for the camera over the lens's aperture range, up to a maximum output aperture of f/0.9, the adapter's optics help to maximize the connected lens's apparent angle of view during UHD 4K video capture.
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Metabones MBSPEF-EFR-BT1 Overview

This T Speed Booster Ultra 0.71x Adapter from Metabones allows a full-frame Canon EF-mount lens to be used on a Canon RF-mount camera. While providing a one-stop increase for the camera over the lens's aperture range, up to a maximum output aperture of f/0.9, the adapter's optics help to maximize the connected lens's apparent angle of view during UHD 4K video capture.

When recording UHD 4K video, a Canon RF-mount camera is only able to capture the center portion of the image projected on its sensor, creating an in-camera "crop factor." A Canon EOS R Mirrorless Digital Camera Body and a Canon EOS RP Mirrorless Digital Camera Body feature a UHD 4K crop factor of 1.75x and 1.63x respectively. Inside this adapter, five optical elements in four groups condenses the light from the full-frame lens and effectively reduces the crop factor to 1.24x and 1.15x respectively. This also makes available to the sensor an additional one stop of light throughout the lens's aperture range.

This adapter is constructed from aluminum alloy for durability while minimizing weight and its mounting rings are made with brass to further prevent wear-and-tear. An internal, matte black coating prevents the appearance of reflections within the adapter barrel, and to help reduce stress on the camera mount when placed on a tripod, the adapter includes a detachable Arca-type compatible tripod foot with 1/4"-20 threads.

This T Speed Booster Ultra 0.71x Adapter supports electronic communication between an attached camera and lens. If the lens includes autofocus, image stabilization, as well as camera-controlled aperture functions, this adapter is intended to allow use of those features. Also, if an attached lens is capable of generating EXIF metadata when used with a directly compatible camera, this adapter is designed to transfer that information, so it can be saved along with image files generated the combined Canon EF-mount lens and Canon EF-M mount camera.

  • Allows a full-frame Canon EF-mount lens to be used on a Canon RF-mount camera
  • Supports electronic communication between camera and lens to enable autofocus, image stabilization, on-camera aperture control, and EXIF metadata generation when possible
  • 0.71x magnification maximizes angle of view of combined camera and lens for UHD 4K video capture
  • Provides a 1-stop increase for the camera over the lens's aperture range, up to a maximum output aperture of f/0.9
  • Reduces Canon EOS R Mirrorless Digital Camera Body UHD 4K video capture crop factor from 1.75x to 1.24x
  • Reduces Canon EOS R Mirrorless Digital Camera Body UHD 4K video capture crop factor from 1.63x to 1.15x
  • Allows still image capture with a compatible camera set to APS-C mode
  • Integrated jog dial with press-to-click action can be assigned custom functions when used with a compatible camera
  • Five lens elements in four groups for optical clarity as well as color fidelity
  • Internal, black matte coating minimizes the appearance of reflections within the adapter barrel
  • Aluminum alloy components for weight reduction
  • Brass mounting rings prevent wear-and-tear
  • Detachable Arca-type tripod foot with 1/4"-20 threads can be used to reduces stress on a connected camera's mount
  • Locking mechanism for secure attachment of lens with push-button release

Metabones MBSPEF-EFR-BT1 Specs

Adapter
Camera MountCanon RF
Lens MountCanon EF
Magnification0.71x
Optical Design5 Elements in 4 Groups
Physical
Tripod Mounting Thread1/4"-20 Female
Dimensionsø: 2.8 x H: 0.8" / ø: 70.0 x H: 20.0 mm
Weight7.87 oz / 223 g
Packaging Info
Package Weight0.77 lb
Box Dimensions (LxWxH)4.3 x 4.1 x 2.4"

Metabones MBSPEF-EFR-BT1 Reviews

Game changer for EOS R

By Tim
Rated 5 out of 5
Date: 2021-10-13

I know Canon has moved on with its R series presenting new 4K options, but if you still have the original R which still shoots beautiful 4K, this is a game changer. I've used it for years and never had an issue. The ability to get the full frame effect of your EF lenses and a stop of light is extremely useful. Well worth the price.

NOT COMPATIBLE w/CANON C70

By Joy Over Money
Rated 3 out of 5
Date: 2021-04-21

If you are aiming to use this with the EOS R, fine...if you are hoping to save a few bucks and pair this with your C70...you are wasting your time. It does not fit on the mount.

DOES NOT FIT CANON c70

By Joy Over Money
Rated 1 out of 5
Date: 2021-03-28

For the record not all RF mounts are equal evidently. I could not put this on my Canon C70 which was the intended purpose for me. I tried the adapter from my EOS R and it was interchangeable with my C70 but this adapter isn't. #TRAGIC I give it one star because if it only fits the EOS R that is already full frame. This means you are spending half a grand just to speed boost your 4k cropped shots only?!

Works great on Canon EOS-R, Not for Canon C-70

By Chris
Rated 4 out of 5
Date: 2021-03-03

This speed booster works great on my EOS-R camera body, but it doesn't work well on the C-70. It is well built and is a great addition to the EOS-R body. It's a full stop faster and the autofocus works great.

Doesn’t work with the Canon R5

By James
Rated 4 out of 5
Date: 2020-12-07

I had great fast and prompt service with B&H Photo as always. I bought this In hopes that it would work with my Canon R5 in crop mode for both photos and video for extra reach and light but it didn’t function. As far as I know as of this writing there are no firmware updates available for the Canon R5 or R6. I returned it for this reason. Otherwise it’s a well built product.

Works as designed.

By Dennis
Rated 5 out of 5
Date: 2020-09-14

I'm using it on a Red Komodo and the aperture control doesn't work. Not sure if it's a compatibility issue on Red's part or Metabones. I'll withhold my judgement until I get confirmation. Until then, love the opportunity to get a full frame lens projected onto the Komodo's smaller sensor.

great

By Giuliano
Rated 5 out of 5
Date: 2021-07-12

i loved it

Perfect un-cropped(ish) unlimited 4k on the EOS R.

By Albert
Rated 5 out of 5
Date: 2021-05-28

This pairs perfectly to the EOSR and gets rid of the awful 4k Crop (almost). This also works perfectly with the Canon C70 bringing the Super 35 crop to an almost full frame look. Love it!

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YOUR RECENTLY VIEWED ITEMS

If I put this on an EOS R with the EF 8-15mm ...

If I put this on an EOS R with the EF 8-15mm fisheye lens, will it get rid of the top and bottom crop seen in all video modes at the 8mm full-circle fisheye view, also using current firmware on camera and speedbooster if it has it?
Asked by: Steven
I just tested this for you. So with the original Canon adapter, because of the crop you don't get the full 8mm circle [ in 4K. 1080P you do get the full circle no crop ]. Now with this speed booster, even in 4K you get the full circle at 8mm. So you will get the black edges and the spherical look in the middle.
Answered by: Stephen
Date published: 2020-07-06

Has anybody tried this with a Canon C70? I have ...

Has anybody tried this with a Canon C70? I have and it seems to be unreliable, almost like it has a bad connection. I don't have another RF camera to test it on other than the C70.
Asked by: Keith
With the firmware V1.40 updated. The Speed Booster is compatible with the Canon C70, EOS R5/R6(in crop mode), and the user can assign the control ring functions to the wheel dial of adapter to adjust the aperture/ISO/WB, etc.
Answered by: Support
Date published: 2021-09-11

For use with an R5, any advantage of this vs. ...

For use with an R5, any advantage of this vs. Canon's $100 Mount Adapter EF-EOS R?
Asked by: Chris
You must read the overview. the Metabones adapter is an optical system that modifies your lens. The Speed Booster Ultra 0.71x Adapter from Metabones allows a full-frame Canon EF-mount lens to be used on a Canon RF-mount camera. While providing a one-stop increase over the lens's aperture range, up to a maximum output aperture of f/0.9, the adapter's optics help to maximize the connected lens's apparent angle of view during UHD 4K video capture. It will also change your lenses angle of view. You are comparing totaly different product designed for totaly diferent outcomes.
Answered by: Gary
Date published: 2020-07-20

So if I put this on the Sigma 24mm f1.4 Prime ...

So if I put this on the Sigma 24mm f1.4 Prime Lens, what would it make the aperture on it? Also does it work with that lens?
Asked by: Tee
This is compatible with the Sigma 24mm f/1.4 DG HSM Art Lens for Canon, and it'll be roughly equivalent to a f/0.9.
Answered by: Kevin
Date published: 2020-07-02

will the assignable wheel be recognized by ...

will the assignable wheel be recognized by komodo? Can you assign it to adjust iris?
Asked by: darin
According to the manufacturer, the RED Komodo camera (firmware V1.5.3) is not compatible with the Control Wheel function of the Metabones T Speed Booster Ultra 0.71x Adapter for Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera.
Answered by: Manzell
Date published: 2022-02-14

Will this adapter work for conversion to a super ...

Will this adapter work for conversion to a super 35mm sensor? Particularly to pair with a RED Komodo 6K.
Asked by: Geoff
I have both and it does work on the Komodo, but does not communicate autofocus information.
Answered by: Gery
Date published: 2021-02-21

Would it vignette on the Canon EOS R5/6?

Would it vignette on the Canon EOS R5/6?
Asked by: Andres
won't support Canon R5/R6 with current firmware, so there is no vignette, it's all black screen
Answered by: nick
Date published: 2021-10-01

Will this also increase the aperture for stills ...

Will this also increase the aperture for stills on any particular lens used?
Asked by: Jorge
Its been a while since I returned mine. I was pumped on it at first. But it came with so many limitations. I remember it not being even useful for photos. Do plenty of research before buying.
Answered by: Chris
Date published: 2020-07-18
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