I just finished tweaking the Acros in Caffenol C and yes an EI of 1600 is very possible, as the sample image below shows… 3200 is just a tad past my liking but for some shots it would be usable. Click on both images to see a larger view.
The dark barn boards above the windows were placed at Zone 3… they were EV 0. The detail outside the window fell on Zone 14. The detail image below is a 3″ x 3″ crop from a 20″ x 20″ print… pretty impressive.
My metering technique for these images is a stripped-down Zone approach that will be outlined in some detail in my next book The Photographers Coffee Break … I feel it fits the Caffenol C process quite well.
The sample images below are my second set of test shots processed using Caffenol C… the first image is Ilford FP4+ and the second is Fuji Acros… the Acros in my opinion is quite amazing! The Acros has the lowest fog level of any film I have tested so far (8 films and counting in Caffenol) and has a good usable range and very nice fine grain. The FP4+ was processed using the time posted on Digital Truth with very good success.
I’m not sure if it reads on the screen but in the Acros image there is very good detail in the left side dark region… both images were shot with my Leica MP with a 28mm lens at box speed. The Acros processing time and technique will be discussed later…
Viva la Revolution