Buying Guide
Lens mounts
On the whole, each manufacturer uses its own proprietary lens mount. Notable exceptions are Micro Four Thirds, shared by Olympus and Panasonic, and the full-frame L-mount that’s used by Leica, Panasonic and Sigma.
Built-in focus motor
Lenses for mirrorless cameras invariably use built-in motors for autofocus, which are also used for electronic manual focusing. Silent, video-friendly stepper
