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for daylight exposures 2 Wratten No. 80B (light blue) for using Kodachrome and Ektachrome
Films,
Daylight Type for Photoflood exposures 3
Kodak Polo Screen for reflection control and sky darkening with colour film 4
Example
You want to use a yellow-green filter (F III) for a shot on
black-and-white film. On the film speed scale you have
set, for instance, 50 ASA (graduation before 64). The
opposite table indicates that the film speed setting must be
reduced by 3 divisions if a yellow-green filter is used.
Your new setting on the ASA scale therefore becomes 25
ASA (see illustration).
When the filter is removed again, remember also to reset
the film speed accordingly - in our example - back to 50
ASA.
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