Use to attach Canon EF lenses to Sony E mount cameras.

Has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless cameras with DX-sized sensors from 1.5x to 1.07x. The Speed Booster 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. 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 centre all the way to the edges of the image.