ARRI EF Mount (LBUS) for ALEXA Mini LF
The new EF Mount (LBUS) allows the ALEXA Mini LF or ALEXA Mini to accept lenses with an EF mount and it also provides an LBUS connector. In order to extend the benefits of using EF mount lenses to large-format motion picture productions, ARRI has redesigned its EF mount with a wider light baffle, allowing it to cover the large-format sensor of the ALEXA Mini LF, as well as the Super 35 sensor of the ALEXA Mini. The LBUS connector allows fast and clean setup of external ARRI cforce lens motors, also it frees up EXT connector on Mini LF and Mini.
The use of cine-style EF mount lenses on motion picture cameras has been a popular way to make more affordable optics available to budget-conscious productions. Their mechanical focus rings with physical end stops and industry-standard gears allow the use of external lens motors and precise remote control through ARRI ECS hand units like the wireless WCU-4 and SXU-1 and the wired Operator Control Unit OCU-1 and Master Grips. Setup of external lens motors is fast and clean with the LBUS connector on the lens mount, which frees up the EXT connector on the Mini LF and Mini. With the use of the ARRI Lens Data Archive, metadata from the external lens motors will be displayed as well as recorded.
Additionally, the new mount allows filmmakers to utilize the wide variety of still photo EF mount lenses for insert shots, including vintage lenses, extreme wide-angle lenses, fisheye lenses, tilt-shift lenses, extreme telephoto lenses, macro lenses and other specialist EF mount lenses. For specialty shots, the new mount even powers the image stabilization of some telephoto lenses. Since most still photo EF mount lenses have internal iris motors, their iris can be set by the camera or the ARRI ECS hand units.
The EF Mount (LBUS) reduces the financial entry barrier for purchasing a Mini LF or Mini camera/lens system, since EF mount cine-style lenses are less expensive than LPL or PL mount cine lenses.