Yes, you're more or less correct in that. Kodak suggests times similar to what JCO is using for small tanks with intermittent agitation, although those times are for standard processing, not "push" processing. IIRC, Kodak suggests about 25% - 30% less time when pushing one stop, which is about what JCO's doing - he's using an EI of 250. Times for rotary tanks would be substantially different. Further, Kodak also states in the Darkroom Dataguide that the times they give are for a diffusion enlarger, and that their times should be reduced 20% - 30% for printing with a condenser enlarger, with about a 1/3 stop increase in exposure.
There are plenty of people using constant agitation with the Jobo (and, I suppose, similar setups) but developing time and EI are substantially different than those for hand processing in small tanks. It seems that JCO has not established a correct EI for the film relative to the processing style and printing process he's using. The information on rotary processing for TMY can be found at: http://www.kodak.com/global/en/professional/support/techPubs/f32/f32c.shtml#1148514 That's only a recommended starting point, of course. Based on Kodak's recommendations, he's way off in both EI and developing times, enlarger type and printing process notwithstanding. One of the reasons I suggested the Greenspun board is that JCO can get opinions from several people who've gone through the process and arrived at the other end getting good results. One of the things mentioned in some discussions about TMY and the T-Max developers, is that water quality is a major consideration. Water hardness and chemicals in the water have been shown to have deleterious effects on the quality of the negatives, and the use of distilled water is highly recommended. Paul Stenquist wrote: > > I've tried "recipes" similar to the one > that JCO is using. It's right fromt he > Kodak Darkroom Dataguide, with more exposure > and less development. It works rather well, > but it is designed for only intermittent > agitation. -- Shel Belinkoff mailto:[EMAIL PROTECTED] http://home.earthlink.net/~belinkoff/ You can't have everything. Where would you put it? - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
