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

SKU: MBSPEFEFRBT1 MFR: MB_SPEF-EFR-BT1
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Key Features

  • Maximize your Canon RF camera with this Metabones EF lens adapter.
  • Achieve wider shots with the 0.71x Speed Booster on your Canon RF mount.
  • Maintain superb image quality using Canon EF lenses on EOS R cameras.
  • Enjoy full-frame lens compatibility on your Canon RF-mount camera body.
  • Reduce crop factor effectively using this Metabones lens adapter.
  • Get a brighter aperture and shallower depth of field with this adapter.
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Special Order?Estimated to Ship: 08/19/2025
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ALEX A : I’m having trouble mounting EF sigma lenses. Doesn’t seem to want to connect. Any suggestions?
Shopper : Why Did You Choose This?BROOKS T : because it helps me get more out of my lens collection

Reviews about this item

Review Summary

2020-06-14T04:18:31

Rated 5 out of 5

Get one today

Love this adapter! Changes my 1.7 eos r 4k crop to 1.24 and makes all my lenses I mainly 2.8 or faster, I feel that much more inspired and capable of shooting cinematic footage now due to this adapter. Its priceless truly!

DON M.

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Metabones Canon EF Lens to Canon RF Camera T Speed Booster ULTRA 0.71x Adapter Specifications

  • Compatibility

    Canon RF series camera: EOS R and EOS RP
    Canon EF-mount Lens
    Canon EF-Extender (Teleconverter)
    Carl Zeiss EF-mount Lens
    Sigma EF-mount Lens
    Tamron EF-mount Lens
    Tokina EF-mount Lens
    Contax N mount lenses modified to Canon EF by Conurus
    Contax 645 NAM-1 adapter modified to Canon EF by Conurus

  • Camera Mount

    Canon RF

  • Lens Mount

    Canon EF

  • Magnification

    0.71x

  • Optical Design

    5 Elements in 4 Groups

  • Tripod Mounting Thread

    1/4"-20 Female

  • Weight

    7.87 oz (223g)

  • UPC Code

    4897050182574

Models
Metabones Canon EF Lens to Canon RF Camera T Speed Booster ULTRA 0.71x Adapter
$479.00

Special Order

Generally ships in 7-14 days, subject to availability

Metabones PL Mount Lens to Canon RF T CINE Speed Booster ULTRA 0.71x II Adapter
$719.00

In Stock

Usually ships within 2-5 Days

FeaturesFull AF Adapter, SpeedBooster / BaveyesSpeedBooster / BaveyesFull AF Adapter
Style-StandardWith ND Filter
Camera Fitting (Male)Canon RFCanon RFCanon RF
Lens Fitting (Female)Canon EOS EFPL MountCanon EOS

About Metabones Canon EF Lens to Canon RF Camera T Speed Booster ULTRA 0.71x Adapter

FEATURED REVIEWS

Get one today

By DON M.

Love this adapter! Changes my 1.7 eos r 4k crop to 1.24 and makes all my lenses I mainly 2.8 or faster, I feel that much more inspired and capable of shooting cinematic footage now due to this adapter. Its priceless truly!

Bring your filmmaking to the next level with the Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera T Speed Booster ULTRA 0.71x Adapter. This high-quality, durable adapter is designed to adapt Canon EF mount full-frame lenses to the innovative Canon RF mount, expanding your lens options and enhancing your camera's capabilities.

This compact and versatile adapter is perfect for filmmakers seeking to reduce the 4k video crop factor of EOS R (1.75x) and EOS RP (1.63x) to 1.24x and 1.15x respectively, bringing the field of view closer to still photo mode. While primarily designed for video, it can also be used for still photography when the camera is configured to APS-C mode.

The Speed Booster ULTRA boasts an advanced 5-element/4-group optical design by Caldwell Photographic Inc., incorporating ultra-high index tantalum-based optical glass. This innovative design ensures extraordinary optical performance, improved corner sharpness, less distortion, and reduced vignetting.

With a magnification of 0.71x, the Speed Booster ULTRA effectively reduces the crop factor of 4k video on EOS R and EOS RP. It's designed to work well with virtually all full-frame SLR lenses, transforming professional-grade f/2.8 zoom lenses into high-speed zooms and high-speed fixed focal length lenses into wider, faster lenses.

The adapter also increases the maximum aperture by 1 stop, with a maximum output aperture of f/0.9, and increases MTF. It features autofocus with adjusted AF speed, dual-pixel autofocus (DPAF), video AF support, and image stabilization (IS) lens support. The built-in multi-function Control Wheel allows for assignable functions such as ISO, shutter speed, or aperture control, and depth-of-field preview.

Constructed from durable aluminum alloy and brass with chromium plating, the adapter is designed to withstand the rigors of professional use. It features a detachable tripod foot compatible with Arca Swiss, Markins, and Photo Clam ball heads, and a rubber gasket to protect the RF mount connection from dust and moisture.

Please note that this adapter does not support 60p (FHD) video, Canon EF-S Lens, APS-C Lens, lens correction such as peripheral shading, CA and distortion, focus confirmation "chip" (e.g. Dandelion), M42 screw mount adapters, or stacking non-Metabones/non-Conurus mount adapters on top.

Experience the difference the Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera T Speed Booster ULTRA 0.71x Adapter can make in your filmmaking today.

Metabones Canon EF Lens to Canon RF Camera T Speed Booster ULTRA 0.71x Adapter Features

  • Metabones EF-RF Speed Booster ULTRA 0.71x - To Adapt Canon EF Mount Full-Frame Lenses To The New Canon RF Mount
  • 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

Warranty Information

This product has a limited warranty of 12 months.

Key Features

  • Maximize your Canon RF camera with this Metabones EF lens adapter.
  • Achieve wider shots with the 0.71x Speed Booster on your Canon RF mount.
  • Maintain superb image quality using Canon EF lenses on EOS R cameras.
  • Enjoy full-frame lens compatibility on your Canon RF-mount camera body.
  • Reduce crop factor effectively using this Metabones lens adapter.
  • Get a brighter aperture and shallower depth of field with this adapter.

What's in the box:

  • Canon Full-Frame EF-Mount Lens to Canon RF-Mount Camera T Speed Booster ULTRA 0.71x Adapter
  • Metabones 1 Year Limited Warranty