I used my Pentacon Six or Pentacon 6 and its majick zebra CARL ZEISS JENA DDR BIOMETER 80mm f/2.8 lens, with, "Ilford Delta-400 Professional 120 Black & White Negative (Print) Film (ISO-400)" and the follwed verbatim recipe at http://www.caffenol.org/recipes/ for said film! http://www.caffenol.org/film-development-chart/ one thing however, as I was uncertain about temp, I put the admixture in the freezer to get it to the 20 degrees until I realized it wasn't Fahrenheit!
[h=3]Delta Recipe for 1000ml stock (Delta-STD)[/h] Mix Coffee and Soda seperate, as it makes it easier to see if the Soda is completely dispersed.
1000ml (1l) Water
24g Washing soda
20g Vitamin C
45g Instant coffee
Teaspoon measuring:
1000ml (1l) Water
12 levelled teaspoons Washing Soda
3 teaspoons of Vitamin C
18 teaspoons Instant Coffee
Let solution stand for about 5 minutes to clear microbubbles.
9:00 11:00 minutes at 20 degrees, fix and rinse as usual.