Is there any problem in developing films at lower temperature (61ºF) in your experience beside the need to develop it for more time?
61F should be fine, but bear in mind that some constituents of developers don't work well at 55F and below.
Just measured mine and it was 4°C. I'm sure it would get colder if I let it run a bit longer. I have seen 0.5°C previously.Yes, my Jobo has the cold-water inlet, but my cold water is about 20C from the tap.
Thank you so much for your information. It’s that I found many of my pictures from a roll of Ultrafine Finesse 400 were too dark using HC-110 dilution B; and wanted to rule out the developer temperature. Perhaps it is a problem with my camera meter (Nikon FE).
I feel like there are some parts of the story that would help to hear:
How much time did you develop? What stop bath did you use?
Did you accidentally mix too strong. Did you mix at 1:7 from concentrate (supposed to be stock) vs 1:31 from concentrate.
When did you start/stop the clock? Did you pre-rinse?
How dark are the negatives anyway can you snap a photo of them with your phone to show them?
Thank you for your interest in helping me further. Here are the answers to your questions:
How much time did you develop? 15:20 min.
What stop bath did you use? water
Did you accidentally mix too strong. I don’t think so. I believe I put 10 ml of concentrate + 290 ml of water.
Did you mix at 1:7 from concentrate (supposed to be stock) vs 1:31 from concentrate. I only use concentrate, no stock solution.
When did you start/stop the clock? after I filled the tank
Did you pre-rinse? no
How dark are the negatives anyway can you snap a photo of them with your phone to show them? see attached picture
I just processed a roll of Acros 100 in HC110 Dil:B and another of HP5+ in Dil:H.
Dev temp was about 63F for both, so I extended the time by about 20% longer than the normal 68F times for each dilution. Both rolls came out fine.
I extended fixing times and wash times a bit longer also.
At 61F I'd probably add another 5-10% to the dev time, but getting below 60F I'd look at bringing up the chemical temps a bit with a warm water bath.
With lower developer temps, I'd expect thin negatives (underdevelopment) to be the risk, rather than denser negatives.
It might be because it was from a bulk roll. I don’t know who is the manufacturer for these Ultrafine Finesse films.Those negs look quite thin, but why are there no edge numbers?
I don’t know who is the manufacturer for these Ultrafine Finesse films
Didn't Aparat do a test of Fomapan 400
and found that it's real speed was about 160? Nowhere near 400 anyway.
The attached picture shows a roll of Finesse 400 shot at ISO 400 using an Olympus Point & Shot IS-1.
Do you know how to do a "zone I" test? Do that and let us know how that went.
A roll of film exposed quite randomly generally doesn't allow for drawing conclusions about the performance of a film/developer combination. Most of the images on this roll, furthermore, appear to be fairly weak in terms of shadow detail, to put it mildly
It's kind of boring/tedious, but the kind of testing @ic-racer alludes at is a more thorough way to arrive at more reliable conclusions about effective film speed.
In any case, underexposure certainly is part of the problem you reported here. Several factors can influence this and the film performing not quite as you might expect is just one of them. Let me put it differently: if you shoot another roll of this film while exposing it as if it's a 200 film, and you still run into exposure problems, that's a pretty firm clue that you have some other causes playing a role as well. I think you'll find this to be the case, if I'm honest.
This test lets you know if you are under or over-exposing your film. Do this test before testing for development time.
Expose a uniform target to zone I. To do this put the ISO dial on 400* and stop down FOUR STOPS. Make the exposure and process it as you are doing. It should be a faint gray frame. Place the exposed and developed frame over the meter and see if it drops the exposure by 1/3 of a stop compared to clear film with no exposure**. If so, your exposure index is 400. If not, check 100 and 200,
*You can do multiple tests on a single roll. Test for ISO 100, 200, 400 to start.
** 1/3 stop = 0.10 Log D
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