The ARRI PL Mount (LBUS) allows you to mount PL lenses to the ARRI ALEXA 35, ALEXA Mini, ALEXA Mini LF, and AMIRA cameras, and a lens accessory can be mounted to the camera with the use of the mount’s LBUS connector (except for the AMIRA, which doesn’t support LBUS). Thanks to reduced internal reflection, there’s no loss of contrast from the lens to the camera’s sensor.