The Tiffen 6.6 x 6.6" Clear Solid Green 4 filter is part of Tiffen's award-winning range of colour filters and is one of the most widely used. They enhance reality by adding a touch of subtlety or drama to the image. This filter allows you to add more "punch" to an otherwise ordinary scene. Tiffen filters give you the control you need to create a scene rather than simply photographing it. The Soft or Hard designation indicates the degree of colour graduation. Whether at Pro or Photo 1 level, Tiffen filters have always been the industry's first choice. - Add colourful excitement to a dull sky - Modify a specific colour in a scene to create a desired special effect - Enhance existing colour or create subtle colour drama - Create a more balanced exposure under uneven lighting conditions 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 ground flat to tolerances of one ten-thousandth of an inch, then mounted in precision metal rings - The ColorCore process allows Tiffen to control the colour and density of their filters, as well as special effects filter characteristics with far greater precision than typical dyed-in-the-mass filters, which typically exhibit colour and density variations. Superior Quality - Hollywood's major film studios rely on Tiffen filters for their multi-million-pound productions - Superior quality and design make Tiffen the overwhelming choice of filmmakers, professional photographers and even NASA - Tiffen has also received an Emmy from the Academy of Television Arts and Sciences for engineering excellence Specifications