Four Thirds system
The G1 was packaged with a 14–45 mm ƒ/3.5–5.6 kit lens (28–90 mm equivalent) and can use all native Micro Four Thirds System lenses regardless of manufacturer. Four Thirds System lenses can be used with an adapter, although response time, especially focus response, can be slower. Legacy lenses from nearly every major manual focus camera mount, such as Leica M, Leica R, Olympus OM, Nikon F, Canon FD, Minolta SR, M42 Screw Mount, Contax/Yashica Mount and others can also be mounted and used in manual mode. Canon EF mount lenses can be used with an adapter, but native EF lenses are electronically controlled, and will therefore not have aperture control or autofocus. The Micro Four Thirds system specification supports lenses with optical image stabilization.