Metabones Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter, Black

SKU: MBSPEFEFRBT2 MFR: MB_SPEF-EFR-BT2
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Key Features

  • Maximize your Canon RF camera's potential with this EF lens adapter.
  • Achieve a wider aperture, up to f/0.9, using your favorite Canon EF lenses.
  • Maintain superb image quality with advanced optics and reduced distortion.
  • Enjoy a 0.71x magnification, effectively reducing your camera's crop factor.
  • This Speed Booster adapter supports autofocus and image stabilization features.
  • Built with robust materials, ensuring durability and Arca Swiss tripod compatibility.
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On Backorder?Expected Availability: 10/2025
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Shopper : Why Did You Choose This?ERIC S : Just got a RED Komodo, want to use Sigma lenses with itDEREK F : I have a Red Komodo and wanted an adapter with a solid mount that does not exhibit any play once connected. Also, the brass fittings on both sides of the mount are a better option than most mounts that merely use aluminum.SHANE H : LENS ADAPTER FOR RED KOMODO

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Metabones Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter Specifications

  • Color

    Black Satin Exterior
    Black Matte Interior

  • Magnification

    0.71x

  • Crop Factor with DX format Camera

    1.07x

  • Maximum Output Aperture

    f/0.90 (with f/1.2 Lens Attached)

  • Rectilinear Distortion

    < 1%

  • Lens Elements/Groups

    5/4

  • Length Reduction

    4.2 mm

  • Camera Mount

    Canon RF

  • Image Format

    DX, APS-C

  • Lens Mounts

    Canon EF

  • Lens Compatibility

    Canon RF Camera
    EOS R, EOS RP, EOS R5, EOS R6, EOS C70
    RED Komodo Camera
    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

  • Special Features

    Long-throw clickless aperture ring on Nikon F/G version; AF/IS support and in-camera aperture selection with Canon EF to Sony E version.

  • Tripod Mount

    Robust Removable Type with Arca Swiss Compatibility

  • Dimensions

    1.06 x 2.99 x 2.83" (27 x 76 x 72mm) for Canon EF version

  • Weight

    6.80 oz (193g)

  • UPC Code

    4897050183113

Models
Metabones Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter
$529.00

On Backorder

Order now, your card will not be charged until it is ready to ship.

Wooden Camera R Mount to LPL Mount Lens Adapter for Canon and ARRI Cameras
$599.00

Ships from Manufacturer

Usually ships within 2-4 Days. Please note: Your card will be charged when order is submitted to the vendor (usually within 24 hours).

FeaturesSpeedBooster / BaveyesSpeedBooster / BaveyesBasic Adapter
Style-Standard-
Camera Fitting (Male)Canon RFCanon RFCanon RF
Lens Fitting (Female)Canon EOS EFPL MountLPL Mount

About Metabones Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter

Take your filmmaking to the next level with the Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter in sleek black. This innovative adapter is designed to adapt Canon EF mount full-frame lenses to the cutting-edge Canon RF mount, making it an essential tool for filmmakers seeking to optimize their EOS R, EOS RP, and EOS C70 cameras.

The Speed Booster Ultra 0.71x significantly reduces the 4k video crop factor of EOS R (1.75x) and EOS RP (1.63x) to 1.24x and 1.15x respectively. This allows for a field of view that closely mirrors still photo mode, enhancing the versatility of your camera. While primarily designed for video, this Speed Booster can also be utilized for still photography when the camera is set to APS-C mode.

This adapter boasts an advanced 5-element/4-group optical design by Caldwell Photographic Inc., featuring ultra-high index tantalum-based optical glass. This advanced technology ensures extraordinary optical performance, delivering improved corner sharpness, reduced distortion, and minimized vignetting.

The Speed Booster Ultra 0.71x is expertly crafted using exotic materials at the forefront of glassmaking technology. It is well corrected for use with virtually all full-frame SLR lenses, regardless of exit pupil distance, making it a versatile addition to your camera kit. It performs exceptionally well with professional-grade f/2.8 zoom lenses, transforming them into high-speed zooms with excellent contrast and resolution.

The adapter is compatible with a wide range of Canon RF cameras, EF-mount lenses, and EF-Extenders, as well as lenses from Carl Zeiss, Sigma, Tamron, and Tokina. It also works with Contax N mount lenses modified to Canon EF by Conurus.

Metabones is renowned for its high-quality lens adapters, and this product is no exception. It features precision-machined brass with chromium plating on both the camera-body and lens sides, ensuring smooth mounting, an attractive appearance, and long-lasting durability. The lens side of the adapter boasts a robust leaf-spring structure, strengthening the adapter-lens connection and reducing wear.

The adapter also includes industry-leading electronic interfacing technology from Canada, offering true electronic control of the lens' aperture directly from the camera body. This allows for automatic aperture selection in P or S exposure modes, or manual selection on the camera body in A or M modes. The adapter also supports EXIF data such as lens identification, focal length, and aperture.

In conclusion, the Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter is a high-quality, versatile tool that enhances the functionality and performance of your camera, making it a valuable addition to any filmmaker's kit.

Metabones Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter Features

  • 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)
  • 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
  • Patented positive-lock EF lens mount
  • 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
  • Aluminum alloy and brass construction with chromium plating
  • Satin surface finish

Warranty Information

This product has a limited warranty of 12 months.

Key Features

  • Maximize your Canon RF camera's potential with this EF lens adapter.
  • Achieve a wider aperture, up to f/0.9, using your favorite Canon EF lenses.
  • Maintain superb image quality with advanced optics and reduced distortion.
  • Enjoy a 0.71x magnification, effectively reducing your camera's crop factor.
  • This Speed Booster adapter supports autofocus and image stabilization features.
  • Built with robust materials, ensuring durability and Arca Swiss tripod compatibility.

What's in the box:

  • Metabones Canon EF Lens to RF-Mount T CINE Speed Booster Ultra 0.71x Adapter (Black)
  • Metabones 1 Year Limited Warranty