The Tiffen 6.6 x 6.6" Solid Color Chocolate 1/4 special effects filter is primarily intended for cinematographic applications. It is available in a wide range of colours and gives an overall tint to the image. It can transform ordinary colour scenes into something interesting.,,,Note: Each colour series is available in grades 1 to 3, with 3 being the darkest,,,ColorCore Technology,,,- Tiffen filters are manufactured using ColorCore technology, a closely guarded proprietary process that involves permanently laminating the filter material between two pieces of optical glass polished to tolerances of one ten-thousandth of an inch, then mounting them in precision metal rings,- The ColorCore process allows Tiffen to control the colour and density of their filters, as well as the characteristics of special effects filters with precision far superior to typical dyed-in-the-mass filters, which typically exhibit colour and density variations,,,Superior Quality,,,- Major Hollywood film studios rely on Tiffen filters for their multi-million dollar productions. Superior quality and design make Tiffen the go-to choice for filmmakers, professional photographers and even NASA,- Tiffen has also received an Emmy from the Academy of Television Arts and Sciences for excellence in engineering,,,Specifications,