The HDx35 is an optical doubler with a 2.5 stop light loss, for use with the Arri ALEXA, Phantom HD Gold (1920x1080), RED One, Epic – (all 4K formats), Sony SRW-9000PL, PMW-F3 and FS100 (PL Mount adapter required) The Adapter turns the B4 lens into a longer focal length lens, so that the relative depth of field expected for the larger sensor is achieved, while the usual field of view when the lens is mounted to a 2/3” camera is maintained. All HD Adapters also optically correct for the different spectral alignments between three-chip prism block sensors, for which the B4-mount lenses were designed, and the single sensor of the large sensor cameras. HD Adapters are highly telecentric in design, delivering a bright, sharp image across the entire frame, with excellent color and contrast.