Metabones Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x

Canon EF lenses on Micro Four Thirds with a wider field of view

The Metabones Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x is an active optical adapter that allows compatible Canon EF lenses to be used on Micro Four Thirds cameras while reducing the effective focal length by 0.71x. On a standard Micro Four Thirds sensor, this changes the usual 2.0x crop factor to approximately 1.4x, giving a noticeably wider field of view and making full-frame EF lenses much more practical for video production.

One-stop increase in maximum aperture

The optical reducer also increases the effective maximum aperture by one stop. For example, an f/2.8 lens delivers brightness comparable to approximately f/2.0 after the reduction, while an f/1.2 lens can reach an effective output aperture of about f/0.9. This is especially useful for interiors, available-light shooting and productions where keeping ISO lower is important. The combination of a wider angle of view and greater light transmission can give Micro Four Thirds cameras a visual character closer to a larger-sensor setup.

5-element optical design and electronic communication

Metabones uses a patented 5-element / 4-group optical design with ultra-high-index tantalum-based glass, optimized for the Micro Four Thirds sensor and filter stack. The adapter supports camera-controlled aperture, EXIF transmission, lens-based image stabilization and, on supported bodies, in-body stabilization. Autofocus is also available with compatible combinations, although performance and supported AF modes depend on the camera, lens and firmware. For critical autofocus work, the exact setup should be tested before the shoot.

Important compatibility notes

The standard EF-MFT ULTRA 0.71x is designed for conventional Micro Four Thirds cameras and supports many Panasonic, Olympus and other MFT bodies. For the Blackmagic Pocket Cinema Camera 4K, Metabones offers a dedicated BMPCC4K version with optics specifically optimized for that camera’s sensor stack, so the dedicated model is the preferred choice when maximum optical performance is required. Canon EF-S lenses are not officially supported without modification, while many third-party EF-mount APS-C lenses can be used depending on image-circle coverage.

Solid construction for production use

Both mount surfaces are precision-machined from brass and chromium plated, while the interior uses a matte-black treatment and flocking to reduce unwanted reflections. A removable tripod foot provides extra support for heavier lenses. Our rental package includes the Metabones Canon EF Lens to Micro Four Thirds T Speed Booster ULTRA 0.71x and a carrying case.

Rent Metabones EF-MFT Speed Booster ULTRA 0.71x at CamCam Rental

At CamCam you can check current availability online and reserve the adapter together with Micro Four Thirds cameras, Canon EF lenses, monitors and rigging accessories. If you are unsure whether a particular camera and lens combination will provide the autofocus, stabilization or field of view you need, our team can help you select and test a suitable setup. We also offer delivery and collection, optional on-set assistant support, after-hours returns, free parking and free equipment tests by arrangement. CamCam is open seven days a week, including weekends.