Alex, the Swedish distributor for EFKE, Photax, says that KB (Klein Bild) 25 & 50 and R (Roll film) 25 & 50 are orthopanchromatic but the KB100 and R100 are panchromatic. They go even further and claim (with some reservation for my translation: "The film (25 & 50) is ortho panchromatic which means that it "draws" red on the correct place on the grey-scale." (source: www.photax.se)(posted 9276 days ago)There used to be a R40 (I still have 5 rolls) that was the first film I tried out with the zone system. It was very fine-grained with Paterson Acutol. And the grey-scale was quite beatiful for nature-photography, I haven't tried it for portraits.
Alex, I'd be interested to know what YOU like about the EFKE films and what developers you use.
Regards, Peter