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> 510 Pyro development question |
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#11
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However and just speculation on my part I'd have thought that it is likely to apply to HP5+ as well. Other films by other makers were not covered and I have no experience of using rotary processing. Mike |
#12
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Now here’s the fun part, on my original data sheet from BEFORE 2020 Delta 100 wasn’t even listed but shortly AFTER in January 2020 Delta 100 appears! Therefore, it seems that I gave my films about 27% less development time. They all print well, those taken on sunny days and those on overcast days. So, with this film dev combo and depending on your rotary device you could start with times around -25% and take it from there.
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MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#13
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So just to be clear, Marty, do your reduced times of about -25% include a pre-wash as well or are they without any pre-wash?
Thanks Mike |
#14
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-25% of development time only and I would always give a 5 minute pre-wash with Bergger PMK. I know the jury is out on whether to pre-wash or not and the influence it has on development.
And more generally, common wisdom on the internet tends to be around -20% for rotary agitation.
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MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#15
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Thanks Marty so just to be sure I have understood your position, it is as follows:
With D100 you use a reduced time of about 25% for rotary processing but no pre-wash. With Bergger PMK you use a 5 min pre-wash and a reduced time of about 25% as well? Is Bergger PMK the only film that you give a pre-wash to and do you give about -25% to all your other films as well? You are right about the jury being out on the size of the reductions for rotary processing. In Ilford's case r that reduction in time seems to be 15%, others mention between 15-20%. Ilford leaves a question mark over what, if any, the reduction should be with a pre-soak. The way it expresses itself allows you to draw your own conclusions but seems to suggest that a smaller reduction is required if a pre-soak is used but no percentage is given because it recommends avoidance of a pre-soak. Ed Buffalo in Unblinkingeye gives the times that several photographers have arrived at for rotary processing and it seems to vary between different films and photographers. It would be nice and simple if everyone agreed that inversion times applied to all rotary processed film as long as a 5 min pre-soak is given. Unfortunately life is never that simple in film processing Mike Thanks |
#16
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No Mike, not quite, Ilford Delta 100 is the film and Bergger PMK is a pyro staining developer.
I would always pre-wash with Bergger PMK for nothing less than 5mins as I believe it helps even development, especially with large format film. I don’t believe in short pre-washes. I’ve read that pre-washes increase contrast and also that it decreases contrast, I’ve never tested the theory! On rotary development, I’ve chosen this method as I don’t trust myself with the ‘taco’ method of shuffling film in a tray, in the dark for LF. For medium and small format, rotary agitation isn’t really a necessity as hand-tank development works very well.
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MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 Last edited by MartyNL; 10th January 2022 at 08:04 PM. |
#17
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Here's an example of Ilford Delta 100 processed in Bergger PMK for 9mins 30sec with continuous rotary agitation.
The photo was taken handheld with a Fujifilm GA645zi, zoomed in.
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MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#18
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Personally I agree with Barry above about Pyrocat-HD. Two parts, not one part is the only disadvantage. Everything else about it is superb. |
#19
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It sounds lethal stuff if carelessly handled Frankly the lesson I have learned from times for rotary processing as opposed to inversion agitation is that it is case of "suck it and see" in each case for any film and developer combination I'll stick to inversion Mike |
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