Metabones launches EF-RF Speed Booster to reduce EOS R 4K crop factor

The new Metabones Speed Booster for Canon EF to RF mounts makes the EF lens 0.71x wider

makes the lens 0.71x wider.
News

Metabones has announced the Canon EF-RF mount T Speed Booster ULTRA 0.71x, price tag $479, which is designed to reduced the 4K crop factor from Canon EOS R cameras.

Metabones says the Canon EF-RF mount T Speed Booster ULTRA 0.71x will mitigate most of the 4K video crop factor from the EOS R (1.75x) and EOS RP (1.63x), reducing it to 1.24x and 1.15x respectively.

The Canon EF-RF mount T Speed Booster ULTRA 0.71x will adapt a Canon EF lens to the EOS R series RF mount and effectively makes the lens 0.71x wider.

The Canon EOS R Speed Booster increases maximum aperture by a stop, and it supports Dual Pixel AF and video AF. Other features include:

Optical

  • Increase maximum aperture by 1 stop. (with a maximum output aperture of f/0.9).
  • Increase MTF (details).
  • 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).

Electronic

  • 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 (see note 3).
  • 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.

Mechanical

  • 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.

Via Canon Watch

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