LuisSamaniego
Hello everyone,
I would like to develop some 4x5 film sheets using the N+1 method. I need to increase the contrast by one stop. In ADOX’s technical specifications, I found a recommended time of 5:30 for HC100 Solution B (Normal).
It is also recommended to reduce this time to 10% for sheet film. This means ~ t_N=5 min. This is in line with one of the suggestions found at https://www.digitaltruth.com/.
As a rule of thumb, Chris Johnson (The Practical Zone System, p. 96) suggests that for films without T-grain, the development time N+1 should be increased to 1.4 t_N. In this case, that means t_N+1 = 1.4 * 5 = 7 minutes.
My question to forum members: Does anyone have experience with N+1 or N+2 development with CHS100 II? If so, could you share your experiences here?
Many thanks for your support.
Luis
[size=1][font=Helvetica]Technical description[/size]
Wolf_XL
...why not take a pragmatic approach to this – as long as your negative falls within the mid-tone range of the density curve, you’ll always achieve a near-perfect result with today’s variable-contrast papers, provided you use the appropriate filters. Back in his day, Ansel Adams only had fixed-gradation paper available and designed his zone system for papers with a gradation of 2–3, because that gave him the greatest leeway above or below... However, if your development lies within the mid-range of your paper’s density curve, you can easily get your negatives to +- 1 or 2 onto the paper simply by adjusting the positive gradation to the desired contrast...
