GamColor Minus Green Cine Filters from Gam are deep dyed polyester color filters which are a superior color medium for use with all types of light.
A minus green comes in handy when you need to correct for the "green" effects of fluorescent and HMI light sources. Minus Green filters can be combined with the Gam CTO or CTB filters to simulate the desired color temperature, GamColor ND, and combination ND/CTO filters.