Black Frost: A fine "black" mist (similar to Black SupaFrost & Black Promist). Subtle softening of skin texture. Flairs highlights and tones down contrast while holding black level. Diamond cut from crystal-clear, water-white optical glass, Schneider filters are ground and polished to a precise flatness and plane-parallelism (exact parallel relationship between front and back filter surfaces). Then, to ensure perfection, this is verified by a laser interferometer. Schneider filters are then checked with a densitometer for consistent density, and tested with a spectrophotometer for proper light transmission. It"s due to this ultra-high consistency, that allows cinematographers to swap like filters mid-shoot with no discernible variation in color or effect. What"s more, the unprecedented purity, color saturation and repeatability of Schneider filters virtually eliminate the need for lab color timing correction. Schneider filters stand up to the most rigorous demands on set or location. Manyfeature Schneider"s specially formulated hard anti-reflective (AR) coating to resist flaking, peeling and scratching. This proprietary coating also reduces light loss and flare to less than 1% per surface, compared to untreated glass that has a light loss of 4% per surface. Schneider screw-on filters feature virtually jam-proof brass precision mounting rings, while unmounted Schneider laminated filters are protected against delamination and edge-chipping by Schneider"s u