Metabones Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R)

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Product Overview

  • 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
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The Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R) 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.

Filmmakers are now able to mitigate most of the 4k video crop factor of EOS R (1.75x) and EOS RP (1.63x) and reduce it to 1.24x and 1.15x respectively. The field of view is now much closer to still photo mode. This also makes available to the sensor an additional one stop of light throughout the lens's aperture range.

This adapter is constructed from aluminium 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-R mount camera.

Note: This Speed Booster is not intended for still photography but will work if the camera is configured to APS-C mode. 60p FHD video does not work at all.


Key Features of the Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R)

  • 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 colour fidelity
  • Internal, black matte coating minimizes the appearance of reflections within the adapter barrel
  • Aluminium 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

Optical

  • Increase maximum aperture by 1 stop. (with a maximum output aperture of f/0.9).
  • Increase MTF
  • Makes lens 0.71x wider.
  • Advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass by Caldwell Photographic in the USA (patent granted).

Electronic

  • Autofocus. AF speed is properly adjusted to account for and leverage the shorter focal length and the brighter maximum aperture.
  • Dual-pixel autofocus (DPAF) and video AF support.
  • Focal length and aperture are adjusted in EXIF.
  • Image stabilization (IS) lens support.
  • Store EXIF data (lens name, focal length and maximum/minimum aperture) for one manual lens in the adapter.
  • Build-in multi-function Control Wheel (turn/ push-in) for assignable functions(eg. ISO, shutter speed or aperture control, depth-of-field preview).
  • LED indicator shows communication status.
  • Powered by camera body. With most lenses, no external power source required.

Mechanical

  • The tripod foot is detachable and compatible with Arca Swiss, Markins and Photo Clam ball heads.
  • Flocking to reduce internal reflection.
  • Rubber gasket protects the RF mount connection from dust and moisture.
  • Aluminium alloy and brass construction with chromium plating.
  • Satin surface finish.

Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R) Compatibility

The Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R) is compatible with the EOS R and EOS RP cameras plus select lenses. For a list of compatible products* please see our specification tab.

* as of July 2020

Are you unsure if the Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R) will be compatible with your camera or lens?

At digiDirect, we pride ourselves on our product knowledge, and the lengths we’ll go to find our customers the gear that is right for them. Our staff are on-hand and ready to help you in any way they can! All you need do is reach out and contact us via our contact form, by giving us a call, or by visiting your local digiDirect store.


  • MPN - MB-201
  • GTIN - 4897050182574
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Adapter

Camera Mount Canon RF
Lens Mount Canon EF
Magnification 0.71x
Optical Design 5 Elements in 4 Groups

Physical

Tripod Mounting Thread 1/4"-20 Female
Dimensions ø: 2.8 x H: 0.8" / ø: 70.0 x H: 20.0 mm
Weight 7.87 oz / 223 g

Important Notes & Compatibility

Compatibility list Canon RF series camera: EOS R and EOS RP
Canon EF-mount Lens
Canon EF-Extender (Teleconverter)
Carl Zeiss EF-mount Lens (see note 2)
Sigma EF-mount Lens (see note 2)
Tamron EF-mount Lens (see note 2)
Tokina EF-mount Lens (see note 2)
Contax N mount lenses modified to Canon EF by Conurus
Contax 645 NAM-1 adapter modified to Canon EF by Conurus
NOTES 1. EF-S lenses do not fit on Speed Booster®. Some EF-S lenses may be modified to fit, but do so at your own risk.
2. EF-S lenses and third-party lenses designed for APS-C format DO NOT WORK AT ALL when used in conjunction with Speed Booster® due to the limitation of image coverage.
3. For use with fast lenses (faster than f/1.4), the pre-boost apertures will be displayed in the camera.
  • Slow lenses will report boosted apertures to the camera body but fast lenses will report pre-boost apertures. We won't show f/0.9 with a f/1.2 lens attached, but show f/1.2 instead.
  • Example:
    a) EF 85/1.2L attached, camera display = f/1.2, physical aperture (lens + Speed Booster® combined) = f/0.85.
    b) Sigma 35/1.4 attached, camera display = f/1.0, physical aperture (lens + Speed Booster® combined) = f/1.0.
4. Some improperly-made M42 screw mount adapters may short the electronic contacts of the Speed Booster® and cause damage to the Speed Booster® and/or camera body.
5. Many manual focus lenses (e.g. OM 28/2.8, OM 50/1.8, Leica R 15/3.5) have rear protrusions (spikes, levers, other appendages) which would damage the optics and/or housing of Speed Booster® They need to be modified before they can be safely used on Speed Booster® Check and make sure there are no rear protrusions from the adapter/lens combination before using on Speed Booster®. Scratches and damages caused by rear protrusions on Speed Booster® are not covered by warranty.
WARNING To update the firmware of a Canon EF lens downloaded from Canon's web site, use Canon's own adapter. While a Metabones Speed Booster has been tested for this use case scenario it is not guaranteed to work and not supported.
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  • Canon EF to Canon EFR mount T Speed Booster ULTRA 0.71x (EOS R)
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