Nikon 72mm Cooling Filter reduce excess red tones that effect
daylight film when shooting early morning or late evening. Nikon
72mm Cooling Filter are also effective if your flash exposures are
too 'warm'. 'A' is the mildest of the 82 series. Nikon
72mm Cooling Filter has a filter factor of 1.3 and requiring 1/3
f-stop of additional light. All light sources, natural or artificial, have
characteristics that affect colour rendition on film. Colour correcting filters
Cooling Filter) are designed to 'warm', 'cool' and/or correct for
the many variations of lighting you might encounter.
Nikon 72mm Cooling Filter have a 'filter factor' which is a
measurement of the light it absorbs. Cameras with internal metering (through the
lens) will automatically adjust the exposure. With external or hand held meters
you must allow for this factor.
Nikon 72mm B2 Cooling Filter
Features - Nikon
72mm B2 Cooling Filter
Recommended to Use for 'cool' mood photography
lenses having 72mm front filter thread
Also ideal to use with flashes whose exposures are too warm
Returns skin tones to natural when shot in
early morning or late evening light
Modern strobes (flash) approximate midday sun and any warming or cooling
filtration with flash should be based on 'daylight'