1. Mar 8, 2009 #1
   

   tiberiustibz Member

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   Are development times proportional? Can you give each developer a relative speed factor and each film a relative development need and multiply the two together to get a starting time? Or does each film work with each developer independently of others?

    
2. Mar 8, 2009 #2
   

   Anscojohn Subscriber

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   IIRC, Eastman once made a circular slide rule computer which gave answers to these questions for that company's films and developers.

    

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