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Patterson tank twiddler ... anybody use it?
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Everybody knows about inverting the tank and some people seem to put their tanks on the development equivalent of a ball mill. Does anybody have any guidance on using the 'twiddler' such as how to, avoid, equivalent inversions etc?

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Inversions are a more consistent unit of agitation. Agitation affects contrast. Increasing or decreasing agitations increases or decreases contrast on your film. The swirl stick is not very consistent way to agitate. When doing cycles of agitation it is more important to have consistent number of inversions than it is to have a set amount of time. Better to do X number of inversions every so many seconds that it is to agitate for X seconds each cycle. Consistency is key. If you are consistent then you can adjust contrast by simply adding or subtraction an inversion each cycle.

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7 months ago