The Heliopan 28mm KB-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 has a 28mm brass mounting ring that is painted a matte black to help reduce reflections. The SH-PMC multi-coated Schott glass provides greater contrast and reduced reflection compared to uncoated filters.
Color conversion filter brings color temperature from 3800 to 5500K for use with daylight film in tungsten lighting situations.
Does not fully correct to 3200K and results in slightly warmer tones than 80A or 80B filtration.
28mm brass mounting ring that is painted a matte black to help reduce reflections.
SH-PMC multi-coated Schott glass provides greater contrast and reduced reflection compared to uncoated filters.