Marumi 80A filters allow for shooting with a daylight film under white home-use electric bulbs brings reddish pictures, for the color temperature of the bulb is too low. The 80A/B do correct color temperature to get natural color tones. The 80A normalizes the color temperature of coming rays from light sources of 3200 Kelvin. The 80B rays from light sources of 3400 Kelvin. The 80A is more effective. This filter is Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting.
More information on Marumi filters: (Link to Marumi International Website)