This is the Lee Green 15 CC Filter (Poly) for Seven5 System [LEEB75CC15G]
The filters in this range can be used either in front of or behind the lens, and reduce the transmission of light at specific wavelengths. Their primary use is to colour balance films, however, the effect of each filter must be determined by tests, or specified by the film manufacturer. They are also useful for correcting light sources for which no standard conversion filter exists, or for introducing a deliberate colour bias. Green principally absorbs blue and red. ...Contact us if you need more help.