The Prolock EF has electrical contacts to allow powered control over the iris in 1/3rd stop increments via keys on the mount. The mount adapter also provides power to IS stabilisation and internal focus servos. When used with the Optitek Optitron Lens Controller, precision repeatable remote focus control is also available. The Optitek Prolock EF requires 12v power, which can be provided via accessory cables to P-Tap or Hirose 4-pin connectors, which are compatible with the PMW-F5 and PMW-F55 as well as the hardwire connection to the Optitek Optitron. The Optitek Prolock EF also features a PL-style clamping lock ring on the Canon EF mount, assuring that the lens will not shift in the lens mount.
