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Phil Davis |
9:30 30 Sep 02 |
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David B. Mark |
15:14 29 Sep 02 |
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Re: Choosing alternative developing times for a film test |
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Phil Davis |
17:46 29 Sep 02 |
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David --
The development process appears to be neither purely arithmetic nor geometric because the rate of contrast increase varies rather considerably for different film/dev combinations. But, as you've observed, the geometric time progression usually results in fairly evenly-spaced curves which is a good thing. So I'd suggest that if you want to extend the development range without increasing the number of film sheets, you might use a higher multiplier. For example, using 1.53 instead of 1.4 will take you from 4 to about 22 minutes in geometric steps and I believe you'll find the curves nicely spaced.
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howard schwartz |
13:42 29 Sep 02 |
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Phil Davis |
17:29 29 Sep 02 |
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David B. Mark |
8:45 27 Sep 02 |
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Phil Davis |
11:32 27 Sep 02 |
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David B. Mark |
14:46 29 Sep 02 |
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Phil Davis |
17:26 29 Sep 02 |
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Phil Davis |
20:11 23 Sep 02 |
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