The adapter uses an optical design of 4 elements in 4 groups to reduce focal length by 0.71x. When used with Canon EF lenses, maximum aperture increases by one full stop. The optical elements have anti-reflective coating and the body is metal. Tripod mounting is supported.
Support for EF-S lenses is not guaranteed. In addition, the adapter does not work with Olympus OM-D E-M1 Mark II and E-M10 Mark III cameras.




