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Warming filters reduce excess blue tones that effect daylight film when shooting sky or sea scenes or in high altitude photography They are also effective if your flash exposures are too cool Bis slightlty warmer than A but has the same filter factor of 14 requiring 1/2 fstop of additional light All light sources natural or artifical have characteristics that affect color rendition on film color correcting filters are designed to warm cool and/or correct for the many variations of lighting you might encounter All filters have a filter factor which is a measurement of the light it absorbes cameras with internal metering (through the lens) will automaticly adjust the exposure With external or hand held meters you must allow for this factor Note Modern strobes (flash) approximate midday sun and any warming or cooling filtration with flash should be based on daylight 81 series warming filters come in several strengths and are available in most sizes Other 81 series filters are 81A a milder effect than 81A 81c Twice the warming effect of 81B 81EF extremely strong warming effect Other useful color correcting filters are 82 series for cooling effect opposite of 81 series 80 series when using daylight film in tungsten lighting85 series when using tungsten film in daylight FLD (daylight) when using daylight film in florescent lighting FLW (bulb) when us
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