PhilippBogner
Hello,
I exposed a few rolls of 120 Adox CHS 25 film at the rated speed and developed them in R09 at a 1:50 dilution, as per the Fotoimpex instructions.
The negatives have turned out very hard. But very sharp and also with fine grain.
What’s the reason for this? The Impex instructions refer to a 1:40 ratio, but I don’t think that’s the cause.
I was shooting in quite high contrast conditions in an old quarry. Should I have assumed a lower speed there? And developed for a shorter time as well?
I really like the film, but if I always end up at the soft end of the filter range when using contrast-reversal paper, I must be doing something wrong.
Please excuse me, but I’m quite a novice in the darkroom and haven’t taken any photos for many years.
Thanks and best regards
Philipp
MirkoBoeddecker
Philip,
As explained in the catalogue description and on the ADOX website, the 25 (like all low-speed films) tends to be quite demanding to work with, and assessing its contrast is more complex than with a 100 or 400 ASA film.
If you add harsh light to the mix, the image can quickly become overexposed.
To start with, I would therefore recommend the 50 (the catalogue describes it as: also very fine-grained, but with the forgiving nature of a medium-speed emulsion...).
Alternatively, you could achieve higher dilution with the APH09, which also helps with the contrast, or, as already suggested, perform overexposure and underexposure (pull).
Best regards,
Mirko
