Archived posting to the Leica Users Group, 1998/11/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]For very slow films (currently APX 25) and what I used to use (ADOX KB14, Agfa Isopan FF, Kodak Panatomic-X), my times ranged from 15 to 20 min at 18 deg. C, depending upon the subject matter and the exposure method I used. Flat light = incident exposure at rated ISO, dev 20 min. Very contrasty light = either a reflected reading of the shadow area or the ISO cut by 2-3 stops with an incident meter. Dev 15 min @ 18 deg. C. Agitation = turn tank over and back plus a quarter turn (after back) every 1-1/2 min. Sometimes a two minute interval. You sort of get a feel for subject/exposure/development-time/agitation and adjust the system accordingly. My roommate (George Nakamura) and I figured all of this out while at Brooks back in the early 60's. Your subject cannot be blank walls or blank sky as the long interval is prone to streaking. My method (Nikor tank and reels) seems to work very well. With such a dilute developer and long development time, streaking is minimal, compensation is at a max, and the adjacency effect seems to stand out. This is a system that you sort of have to work out for yourself. Use the above as a starting point. FWIW, Jim At 07:41 PM 11/6/98 -0800, you wrote: >At 06:16 PM 11/6/98 -0800, you wrote: >>I have used Rodinal since it was invented> >snip > >Jim, >Mind sharing your 1:100 time/agitation regime as starting points for slow >film? >Have used 1:100 with TMYei400 and liked it, want to expore APX 25 etc. >Mike Leitheiser > >"When the trout are lost, smash the state." > Tom McGuane >