snaggs said:Seems the vote is going for XTOL. I have done low dilution rodinol when my local lab said they couldn't process Tech Pan anymore.
Daniel.
Woolliscroft said:You can still get Technidol for Tech Pan, but possibly not for long, so I'd be interested in your time/temp/dilution data. I have a freezer full of the film which should last me a while.
David.
Ole said:Yet another post; yet another opinion:
I don't think "reusing forever" is necessarily a good idea. Do you want to mess about with replenishers and such, or do you want to increase the developing time as a function of the number of films developed, or do you want to use two-bath developers with the extra bath to confuse with others? I think most of us here have at some time grabbed the wrong bottle, and tried developing film in fix! Now add another bottle to the two or three you have already....
http://www.dunnamphoto.com/diafine_developer.htm
How does Diafine achieve all this? In part by being a two bath developer. A Diafine kit makes two solutions. Solution A is the developing agent and solution B is the accelerant. When the film is processed it is first placed in Solution A. The developer is absorbed into the film's emulsion layer. After the recommended time of three minutes solution A is poured back into the bottle. Since it doesn't have any accelerant in it it doesn't weaken over time. If you leave the film in the solution longer than three minutes no harm is done. All the developer that the emulsion can hold is absorbed within three minutes, additional time has no effect.
Next solution B is poured in also for at least three minutes. Solution B contains the accelerant and causes the developer to begin working. Since the amount of developer available is only what was absorbed into the emulsion the development runs to completion, unlike other developers where development is stopped at some pre-determined point. After three minutes or more solution B is poured back into the bottle. Since development has run to completion there is no unused developer left to react with the accelerant in the bottle (though the accelerant may be slightly weakened in practice this has no effect at all.
As with solution A if the film is left in for more than three minutes no harm is done. Development runs to completion in three minutes so longer times in the second solution don't result in over development.
No stop bath need be used, again because development to completion, so fixer can be poured in immediately after solution B is poured out. Fixing and washing are done normally. If you re-use your fixer you can use a water rinse between solution B and the fix to slightly extend the life of the fixer.
One of the great things about two bath development is that the shadows will develop with great detail and the highlights won't blow out. Highlight areas which received the most light require more development. The since the only developer available is what is contained in the emulsion (absorbed during the first bath) the developer is exhausted before all the exposed silver in those areas is developed so the highlights maintain detail and don't block up.
The shadow areas have less exposed silver so there is sufficient developer in the emulsion to develop those areas completely. This results in excellent shadow detail.
Combining those two effects means that contrast is controlled and the resulting negatives will have "normal" contrast even if the original scene had extremely high contrast. Normal contrast scenes are also rendered beautifully. In my testing I found that low contrast scenes don't lend themselves to development with Diafine. The resulting negative can be quite flat. (Update: If low contrast scenes are to be developed using Diafine I have found that shooting the film at the manufacturer's recommended ISO setting will allow the resulting negatives to achieve more normal contrast.)
snaggs said:Just before I goto bed, one last question, how does Delta 400 compare with HP5+ ? I've ruled out FP4 as apparently its not very punchy, even though its fine grain.
Daniel.
snaggs said:Just before I goto bed, one last question, how does Delta 400 compare with HP5+ ? I've ruled out FP4 as apparently its not very punchy, even though its fine grain.
snaggs said:Just before I goto bed, one last question, how does Delta 400 compare with HP5+ ? I've ruled out FP4 as apparently its not very punchy, even though its fine grain.
Daniel.
snaggs said:You cant in Australia, at least thats what Ive been told. I went with [...]
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