rob2c
Perhaps I should rephrase the question:
I’d like to carry out some initial tests with the ADOX CHS 25/50/100 soon and
develop them in ADOLUX APH 09 or Rodinal.
Does anyone here have any experience with this combination?
In the list for the CHS 25, Impex specifies 6 minutes for APH 09 at a dilution of 1+40.
However, a lower dilution is often recommended, at least for the CHS 25!
The digitaltruth.com website specifies 18 minutes for the Efke 25 in R09 at 1+100 and
25 ASA – can I apply the same for the CHS 25 in APH 09?
The Impex catalogue states regarding APH 09: …can be used highly diluted up to 1+400? –
but there are people who have found that after 15 minutes at high
dilution, the developer is quickly used up (dead)!?
Others report a lack of consistency in the emulsions. That wouldn’t be great, of course, if
you had to retest with every new batch...
Regards
Robert
cfb_de
Hi Robert,
I developed my Efke R50 in Rodinal. 7–9 minutes (depending on the batch!) with a 15-second agitation and 1-minute pre-warm-up, at 18°C. It’s coming out really well.
You’ll probably only be able to apply this time to the ADOX films after testing them first. Due to the small production batches, there’s a very high degree of variation within the emulsion.
Regarding the high Rodinal dilutions: I have measurements (including from other people) that clearly show that half a litre is completely dead after 17 minutes in the Agfa agitation. In my opinion, the whole business of static development in homeopathic dilutions is all about faith, love and hope. But it’s no longer about developing film.
Which isn’t to say that users can’t be satisfied with such crude methods.
Best regards,
Franz
Wolfgg
Hello Robert,
Sometimes it takes a while to get a reply. Here are some measurements from a ‘Zonenfritzen’ as a guide, using Efke 25 film purchased in early 2005:
Development to N (Zone 1 0.1D above the fog, Zone 9 1.5D above the fog (=0.1D) for Spezial paper (K=32)):
Rodinal (Original) 1+50 9 mins 20°C Agitate continuously for the first 60 seconds, then twice at the start of every minute.
The film achieves exactly the nominal sensitivity here, i.e. Zone 5 at 15 DIN. However, the curve rises slowly; at Zone 5, D=0.5 instead of 0.75 above the fog. Do not engage in overexposure; density does not exceed 1.8D.
Development at N+1 (Zone 1 0.1D above the fog, Zone 8 1.5D above the fog for Special Paper (K=32)):
Rodinal (Original) 1+50 14 mins, residue as above.
ISO sensitivity here is 17 DIN when metering with a light meter or using a grey card.
N-1 is not feasible, as the curve already flattens out by 1.3D at the development times or dilutions required for that.
I have not checked for batch variation.
Regards, Wolfgang
