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.
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
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|Camera Mount||Canon RF|
|Lens Mount||Canon EF|
|Optical Design||5 Elements in 4 Groups|
|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|
|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
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.
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.|