Schneider 4x4" Clear Optical Flat AR (Anti-Reflective) Professional Glass Filter.

• Schneider Optics Professional Clear Optical Flat Glass Protection for your Lens.

• Extraordinary filters for many industries including still photography, Television Broadcasting, Cinematography & Digital Projection. These filters are Diamond cut from crystal-clear, water-white optical glass, and 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. They are then checked with a densitometer for consistent density, and tested with a spectrophotometer for proper light transmission. Ultra-high consistency allows cinematographers to swap like filters mid-shoot with no discernible variation in color or effect.
• Unprecedented purity, color saturation and repeatability virtually eliminate the need for lab color timing correction.
• Many feature 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 filters can be used in front of even the longest lens.