True ND 4x6 ND 0.3 Lens Filter

The True ND 0.3 is a high-end, professional-grade cinema neutral density filter. While colloquially referred to as a "4x6," its exact dimensions are 4 x 5.65 inches, which is the industry-standard size (often called the Panavision standard) designed to drop directly into the rectangular filter trays of a professional matte box like an ARRI, Chrosziel, or Bright Tangerine. An ND 0.3 density reduces the incoming light by exactly one full stop, allowing a cinematographer to open their lens aperture slightly for a shallower depth of field without overexposing the camera's sensor.

Because modern digital cinema sensors (such as those in RED and ARRI cameras) are highly sensitive to infrared (IR) pollution, using standard ND filters often causes deep blacks or dark fabrics to look muddy and reddish-brown. True ND filters are highly coveted in the film industry because they utilize a proprietary metallic alloy coating that attenuates both the visible light spectrum and the near-infrared spectrum at the exact same rate. This guarantees that the image remains perfectly color-neutral, eliminating the need to stack a separate IR-cut filter in front of the lens.