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页码 12
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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