Yes, precisely.
Should have a seperate working solution for Foma films or I can use that weak solution for all the films, like 30sec soaking?
Only one way to find out.
Yes, precisely.
Should have a seperate working solution for Foma films or I can use that weak solution for all the films, like 30sec soaking?
Interesting. For many years I've shot Foma 200 in 120 rolls and have never exerienced the problems that others report. I always use tap water as a stop. Could that be the controling variable here?
I am looking for inexpensive B&W. ISO100 as I would like fine grain, high res. I found that B&H sells Fomapan 100 classic relatively inexpensive. Is it any good? I am sure it's not as good as Kodak T-max 100?
Started using a very mild stop consisting of citric acid...5g/litre
For many years I've shot Foma 200 in 120 rolls and have never exerienced the problems that others report. I always use tap water as a stop. Could that be the controling variable here?
That's in fact a quite aggressive stop bath at pH2.4 and about just as aggressive (even a little more so) than the also usual 0.5-2% acetic acid.
Hardly. I tested quite extensively when I ran into this problem, also with a pure water stop. It didn't affect the problem at all. Moreover, the nature of the problem did not allow itself to be explained as a result of a chemical problem during processing. It quite clearly looked like pre-existing emulsion damage. The fact that Foma also acknowledged it's a manufacturing defect after I sent them samples of my affected film was enough to put it to rest for me. It just seems that the defect was/is intermittent and some parts of their master rolls happen to be unaffected. Despite this, people have kept speculating about processing variables, cameras used etc.
Mind you, I continue to use it in sheet film format and I'm very happy with it. With a stop bath, too, which doesn't do any damage to it.
I only use 120 Foma, usually dried either on a darkroom dryer or overnight. No issues at all with curl and the negs lay really flat. Interestingly, Ilford's has some transversal curl which takes a bit of laying down in the binder to flatten. I actually like the PET base and specially like the idea of its dimensional and archival properties compared to Acetate.It seems that Foma's anti curl layer is a little less effective than e.g. Ilford's; they're just a little less proficient at matching the curl rates/extents of both sides of the film. The result will that Foma's films will curl more, and that this curling will depend to a significant extent on the drying conditions and the final moisture content of the emulsion. A little moisture left in the emulsion will leave it more supple and less curly, so drying film under higher humidity conditions will pose less of a curling problem. Drying film in a very low humidity environment, and drying it for a long time, will result in a very low remaining moisture content and a very curly (and somewhat 'crispy') film.
Still pH 3...
The old was extremely curly, like I remember, and the new did not have any significant curling problems at all.
Film curls badly if it has been stored rolled up for a long time. Fomapan 100 dried perfectly flat a decade ago just like it does today. At least it did when I shot it back then and it still did last time I bought a roll, a few years ago (shot some of that over the past two weeks).
Though I was getting the curling problem from fresh Foma a decade ago.
I tested a roll of old (10 year expired) and new Fomapan 100 recently in 35mm. The old was extremely curly, like I remember, and the new did not have any significant curling problems at all.
I am looking for inexpensive B&W. ISO100 as I would like fine grain, high res. I found that B&H sells Fomapan 100 classic relatively inexpensive. Is it any good? I am sure it's not as good as Kodak T-max 100?
FWIW I never had a problem with Foma curling in 35mm sizes over the past 25 years, but significant curling in 120. The substrates of the two films are different and that accounts for the differences in how the film dries. I shot only Foma 200 in 35mm and it always dried flat as a pancake for me. I wish the same could be said for Foma’s roll films.
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