Metabones Canon EF to EOS M T Speed Booster ULTRA 0.71x Adapter

• Canon EF mount lens to Canon EF-M mount (EOS M series) camera.

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.
• Focal length and aperture are adjusted in EXIF (see note 3).
• Image stabilization (IS) lens support.
• VIdeo Digital IS support (on supported camera bodies).
• Store EXIF data (lens name, focal length and maximum/minimum aperture) for one manual lens in the adapter.
• 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 EF-M mount connection from dust and moisture.
• Aluminum alloy and brass construction with chromium plating.
• Satin surface finish.

Speed Booster® ULTRA for EF-M Mount, E-Mount and X-mount cameras

Sharper corners, less distortion, reduced vignetting

Optical design:  advanced 5-element/4-group optical design incorporating ultra-high index tantalum-based optical glass to achieve extraordinary optical performance with improved corner sharpness, distortion and reduced vignetting.

Like the revolutionary original Metabones Speed Booster® announced in January 2013, the Speed Booster ULTRA has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless cameras with DX-sized sensors(APS-C), such as Sony E-mount and Fuji X-mount cameras, from 1.5x to 1.07x.  However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is well corrected for use with virtually all full-frame SLR lenses regardless of exit pupil distance. Thus, the Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon to produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively.  Similarly, high-speed fixed focal length lenses such as a 50mm f/1.2 will be transformed into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center all the way to the edges of the image.