Gast
I’d be interested to know whether you can control the contrast by adjusting the dilution of Rodinal, whilst of course adjusting the development times accordingly.
I suspect that the contrast increases if you use a more concentrated Rodinal solution—for example, 1:12 instead of 1:25. Has anyone ever tried this? What other effects does it have?
Gast
Jens,
Yes, that’s right,
the higher the dilution, the softer, more balancing, fine-grain (but harder!) and more sharp the developer works.
However, from a dilution of 1:100 onwards, with soft films (Hp 5), you can only achieve sufficient contrast to a limited extent.
1:10 paper developer
1:25 strong film developer
1:50 balancing film developer
1:100 hard negative material/documentary films for pictorial photography
Roland
PS: If anyone comes along and tells you that Rodinal only lasts 20 minutes at 1+50, I’ll object straight away – the evidence hasn’t been presented in an acceptable manner!
Gast
"But Hüter" means the film grain becomes harder, hence "Konturenschäfer"
piu58
One more point: increased agitation (e.g. constant tilting or rotation) has a similar effect to a higher concentration. This is due to the thinner diffusion layer; vigorous agitation increases the concentration of the developer directly on the film.
