This Metabones Speed Booster is a well made and quite brilliant adapter for those who’d like to mount Canon EF-mount lenses on Micro Four Thirds cameras. Not only does it allow control of the aperture in a Canon lens from a Micro Four Thirds camera, it supports image stabilisation where present and allows the camera to record EXIF data. With a magnification of 0.64x and advanced 6-element optical design users can transform Micro Four Thirds cameras into super-35 format 4K cine cameras while achieving extraordinary optical performance at apertures up to an incredible f/0.80. Autofocus is also supported, but we should point out it’s worth double-checking camera compatibility first.

The Metabones Canon EF lens to Micro Four Thirds T ULTRA 0.71x Speed Booster uses an advanced 5-element 4-group optical design incorporating ultra-high index tantalum-based optical glass.