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Metabones Canon EF to Canon RF Speed Booster T Ultra
becomes available?

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Metabones Canon EF to Canon RF Speed Booster T Ultra

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4 Day Rental Price:



*up to 2nd day air - overnight available

The Metabones Canon EF to Canon RF Speed Booster T Ultra allows you to mount any full-frame Canon EF-mount lens to Canon RF-mount cameras with a crop-factor when shooting in 4K. Key features include:

  • Canon EF lens to Canon RF body

  • Wider focal length and increased aperture

  • Electronic communication with the camera

  • Not compatible with Canon R5 or R6

Lens Compatibility. The Metabones Canon EF to Canon RF Speed Booster T Ultra allows full-frame Canon EF and third-party EF-mount lenses to be used on crop-frame RF-mount cameras like the Canon EOS R and EOS RP that can not shoot full-frame 4K video. This adapter does not support the Canon R5 or R6.

Camera Compatibility. This adapter offers limited autofocus, image stabilization, and aperture control with the RF-mount Canon EOS R and EOS RP cameras and Canon EF-mount lenses. For more information, you can check the manufacturer’s compatibility list here.

Wider Focal Length and Increased Aperture. This version of the Speed Booster widens the mounted lens’s focal length by 0.71x, reducing the Canon EOS R’s UHD 4K video capture crop factor from 1.75x to 1.24x and reducing the Canon EOS RP’s UHD 4K video capture crop factor from 1.63x to 1.15×. It also increases the mounted lens’s maximum aperture by 1 stop. This Speed Booster wasn’t designed for still capture, but it’ll work with a compatible camera set to APS-C mode. You can’t use this Speed Booster to capture 60p FHD video.

Electronic Communication. The adapter’s mount has electric contacts that allow you to use compatible lenses’ autofocus, aperture-control, and image-stabilization functions. For most lenses, the adapter doesn’t require a separate power source, and EXIF data is transferred and embedded into your footage.

Sturdy Design with Built-In Tripod Foot. The aluminum-alloy barrel and brass mounts give it a solid feel, with an Arca-Swiss compatible tripod foot that lets you mount the adapter itself directly to a tripod. This ensures the lens’s weight doesn’t put additional stress on the camera’s mount.

Q & A

  • Do you recommend this product for professional work?
    • We can’t recommend this product for professional work. We reached this decision after Lensrentals folks and rental clients experienced repeated failures in the field. Though it might work much of the time, it’s our opinion that this product’s performance is too unpredictable to be trusted on high-value projects. Use for casual testing or try-before-you-buy purposes only. If you have any questions, please contact us.

  • Does this adapter allow slam infinity focus?
    • This adapter doesn’t allow slam infinity focus. Every lens will be slightly different, and they’re designed to be this way. If you do any infinity-focus adjustment to this adapter, we’ll charge you.

  • Is this adapter compatible with Canon EF-S mount lenses?
    • This adapter isn’t compatible with Canon EF-S mount lenses.

  • Autofocus





    Full Frame



    Focal Length




    Hood Included


    Image Stabilization


    Item Type




    Lens Mount

    Canon EF

    Lens Type




    Mfr. Model Number



    Canon RF

    Tripod Mount

    1/4"-20 Female


    0.5 lb.

    Metabones Canon EF to Canon RF Speed Booster T Ultra

    Canon EF Body Cap

    Canon RF Rear Lens Cap