The Hitech 6 x 6" 80C Filter is a color conversion filter that helps to increase the color temperature from 3800 to 5500K. The 80C allows you to use daylight-balanced film in tungsten lighting, but does not fully correct to 3200K, resulting in warmer colors when compared to an 80A or 80B filter.
There is a 2x filter factor with this filter, requiring an increase of 1 stop for normal exposure. It measures 6 x 6" / 152.4 x 152.4mm and is constructed out of CR-39 dyed resin.
Color conversion filter brings color temperature from 3800 to 5500K for use with daylight film in tungsten lighting situations.