The Prolock EF has electrical contacts to permit supercharged management over the iris in 1/3rd stop increments via keys on the mount. The mount adapter additionally provides power to IS stabilization and internal focus servos. Once used with the Optitek Opteron Lens Controller, exactitude repeatable remote focus management is additionally offered. The Optitek Prolock EF attracts its power directly from the camera mount; therefore no extra cable is needed. The Optitek Prolock EF additionally options a PL-style clamping lock ring on the Canon EF mount, reassuring that the lens won't shift within the lens mount.