John writes:
> Although we cannot see it, film is sensitive to UV which will create a
slight haze in
> the photograph and reduce its contrast.
Modern color films have a UV inhibiting layer in the emulsion. I personally
wonder if a UV filter does anything that the UV layer doesn't already do.
> The Skylight is most useful for slight color correction when
> the subject is in the shade illuminated by the light from a blue sky (north
> side of a building in the shade of the building), or under an overcast sky,
> but not illuminated by direct sunlight.
Years ago I tested a wide variety of warming filters in order to get correct
color balance in landscapes of sky lighted scenes. It takes a real strong
filtration to correct the cold color temperatures of skylight (above 10,000
degrees Kelvin is my recollection)! In my testing, one needed stronger than
a 81EF filter. The Skylight filter was barely perceptable as a warming
filter.
In practice, totally shaded landscapes often aren't attractive
photographically, based on poor lighting alone. I often had to do photo
documentation of north-facing cliffs, so at least I wanted something in the
ballpark, color-wise. (My slide shows would mix sunlight and shade shots, so
the differences in color balance were quite noticable without proper
filtration). Now that I'm not doing much in photo documentation landscapes,
I find I often don't filter shaded scenes. Rather, I use Velvia. Gives it
the warming punch of a 81B, although no where near as strong as a 81EF.
Gary Reese
Las Vegas, NV
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