Proportional Development

Discussion in 'B&W: Film, Paper, Chemistry' started by tiberiustibz, Mar 8, 2009.

  1. tiberiustibz

    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. Anscojohn

    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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