Proportional Development

Hensol woods

Hensol woods

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Harbour at dusk

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Harbour at dusk

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blossum in the night

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blossum in the night

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Brown crested nuthatch

A
Brown crested nuthatch

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nickandre

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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?
 

Anscojohn

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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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