Here is an interesting side by side… shot within a few minutes of each other. The BW400CN is an EI of 200 (this film in my Caffenol C process has a very usable EI range from 50-800). The Fuji Acros is an EI of 100 (box speed… depending on processing time the Acros has a usable EI from 50-800). Both can go further in either direction but this range is the real sweet spot. The crops represent a 4″ x 4″ from a 20″ x 20″ image size… yes the BW400CN has more grain but it is much sharper and I am not sure the grain would even print at the 20″ x 20″ size. Both films have fantastic reciprocity characteristics with no adjustment required until 120 sec.
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Viva la Revolution-