Well . . . if they're true yellow and orange . . .
K1, K2, X1, X2, G, etc. (Wratten # 3, 5, 6, 8, 9, 11, 12, 13, 15, etc.) . . .
you are now the proud owner of filters intended for B/W film.
Other types that have yellowish or orangish appearance can be color
balancing filters (e.g. 81A, 85 or 85B) to balance daylight to
tungsten (type L) or cinema ("photolamp" type A) films.
Lighter yellow filters for B/W are generally used to cut down a B/W
film's blue response for a more natural tonal rendition. Darker
yellow, orange, and red are often used to darken blue sky to provide
greater contrast with clouds, light colored buildings, snow, etc.
Yellow has some effect, orange has more, and red has the most.
In general colored filters are used with B/W to provide tonal
separation between one or more colors. Filter color is selected
based on the colors for which separation is desired. It does
require some thinking and some experience. Using a light yellow and
doing portraits of people with blonde hair can make the hair appear
too dark. Using a red and photographing a red barn can make the
blue sky very dark, but the barn too pale. It takes some
experimentation and experience to develop a skill for visualizing
how various B/W filters will affect rendition of various colors on
B/W film.
-- John
John,
Being a novice filter user something you said confused me. I
understand why a red filter transmitting red light would make the
barn too light, but why would a filter that transmits yellow make
blonde hair dark especially when it lightens deciduous foliage which
has a strong yellow component in the green?
--
Winsor Crosby
Long Beach, California
?
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