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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.