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Metabones Canon EF to RF T Speed Booster ULTRA 0.71x adapter, black metal barrel with lens mounts on both ends

Metabones

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

SKU CH-GYQW-668ZX

Adapts Canon EF lenses to RF cameras with 0.71x optics, widening the field of view and reducing 4K crop factors to 1.24x on EOS R and 1.15x on EOS RP

  • Wider 4K video view on EOS R at 1.24x crop
  • Brighter exposure with a 1-stop aperture gain
  • Sharper corners and less distortion via 5-element optical design
  • Works with Canon EF, Zeiss, Sigma, Tamron, Tokina lenses
  • Reduces EOS RP 4K crop to 1.15x for near-full-frame view

Metabones EF-to-RF Speed Booster ULTRA 0.71x

This adapter connects full-frame Canon EF-mount lenses to Canon RF-mount cameras. It uses a 5-element optical design to reduce the crop factor and increase brightness. The unit suits videographers and photographers who want wider fields of view from existing EF glass. It is built for EOS R and RP bodies.

Filmmakers reducing 4K crop factor

The adapter cuts the 4K crop factor on EOS R from 1.75x to 1.24x and on EOS RP from 1.63x to 1.15x. It also works for stills when the camera is set to APS-C mode. Photographers who only shoot full-frame stills will not gain the crop reduction. Users with RF-native lenses or non-EF mounts need a different solution.

0.71x magnification factor

The 0.71x magnification delivers a wider angle of view and a brighter aperture compared to a simple mechanical adapter. This single optical specification determines whether the crop reduction matches your shooting format. Check your camera model and intended mode to confirm the effective crop values.

Highlights

  • Wider 4K video view on EOS R at 1.24x crop
  • Brighter exposure with a 1-stop aperture gain
  • Sharper corners and less distortion via 5-element optical design
  • Works with Canon EF, Zeiss, Sigma, Tamron, Tokina lenses
  • Reduces EOS RP 4K crop to 1.15x for near-full-frame view

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the Metabones Speed Booster ULTRA 0.71x adapter on my Canon RF camera, and what step do people often miss?

Mount the adapter to the RF body first, then attach your EF lens; the step many forget is setting the camera to APS-C mode for still photography, otherwise the image circle will not cover the full sensor.

What maintenance or replacement will the Metabones Speed Booster ULTRA 0.71x adapter need over time?

The adapter has no user-serviceable parts; keep the optical surfaces clean with a blower and microfibre cloth, and protect the electronic contacts from dust when the adapter is off the camera.

What limit appears first when using the Metabones Speed Booster ULTRA 0.71x adapter for extended 4K video sessions?

The 4K crop factor is reduced from 1.75x on the EOS R and 1.63x on the EOS RP down to 1.24x and 1.15x respectively, so the field-of-view advantage is the first constraint you encounter.

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