Hello,
I would recommend the two-bath developer Emofin from Tetenal. For further details, please visit
http://www.tetenal.com/f_photo_consumer_se...download_de.htm, where you will find
the document "Complete collection of beta/time curves".
Unfortunately it’s in German and Tetenal doesn’t have it in English, but the beta versus time graphs are self-explanatory. If you develop Neopan 400 with Emofin to a contrast of 0.5, Tetenal rates the Neopan as 800 ASA (the table in the document states speed 30, which is DIN 30. Tetenal defines speed as 0.1D above background.
Note that each graph is accompanied by two tables: the upper table is for rotary processing, the lower table is for drum processing with 10 seconds of agitation every minute.
Regards
Heinrich