I've just starting using Rodinal 1+50 with Delta 100 in both 35mm and 120. Is there a minimum amount of concentrate required? For the 120 I mix 9ml. with 450ml. water and this fills my 16oz. tank. But if I want to mix approximately 8oz. of solution for 35mm./36 exposure will 4 to 4 1/2ml. of Rodinal be enough? Thanks for your responses.

-- Jeff Schroeder (jeffs@cnsp.com), November 11, 1999

Answers

I generally consider 1 ml Rodinal concentrate per sheet of 4x5 film to be adequate. Since a 36 exposure roll of 35mm is roughly equivalent to a sheet of 8x10 (4 sheets 4x5), I would say that, yes, 4 ml's would be about right. Anyway, I have developed INNUMERABLE rolls of 36 exposure film in my day, many, many of them in Rodinal 1:50, and never had any problems. Go for it.

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-- Peter Hughes (leonine@redshift.com), November 11, 1999.