K&F Concept EF-M4/3 Pro – Canon EF Lens to Micro 4/3 Mount Adapter

The K&F Concept EF-M4/3 Pro adapter lets you mount Canon EF/EF-S mount lenses on Micro 4/3 mount cameras. Made of copper and aluminium alloy, the adapter holds the lens firmly with no play. It is a purely mechanical adapter without electronic contacts: focusing is manual, the adapter does not control the aperture of EF lenses, and infinity focus is retained.

Which lenses and cameras

On the lens side it takes Canon EF/EF-S mount lenses. On the body side it fits Micro 4/3 mount cameras.

Build and mounting

The adapter is made of copper and aluminium alloy, so it sits firmly, without play or twisting. A matte anti-reflective finish inside reduces reflections within the adapter. A red dot makes mounting easy: align the dots and turn the lens and the body about 90° until the mount clicks.

Manual operation

The adapter has no electronic contacts, so the camera does not recognise the lens and neither autofocus nor automatic aperture control works. Focusing is manual; the adapter does not control the aperture of EF lenses. Infinity focus is retained. Before first use, enable shutter release without a lens in the camera menu (e.g. “Release w/o Lens” – the name varies by model), otherwise the camera will not fire.

Tips for use

• On telephoto lenses the infinity mark (∞) is deliberately offset slightly to allow for thermal expansion, so check infinity focus in the viewfinder or on the screen.
• On a Micro 4/3 camera the focal length is multiplied by roughly 2×.