Archived posting to the Leica Users Group, 2002/01/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mike Durling wrote: > > Mark, > > I actually saved your teaspoon recepies for D23 and weighed them when I got > my scale. Your teaspoon of metol and coffee measure of sulfite is almost > exactly my 1:1. I do agree that higher dilutions are something to try for > the future. As for sharpness, the edge effect may help, but I think I'm at > the point where the film is not the limiting point for sharpness in my > imaging chain with this emulsion. > > Mike D > Mike film would not be the limiting point for sharpness with a coffee measure of sulfite for your D23. A coffee measure of sulfite is around 40 grams of sulfite. Am i right? Compared to D76 1:1 which would be 50. A "classic" amount would be 30 according to I think Crawley. But these are all "solvent developers" as there is a healthy amount of sulfite in them. To have film be the limiting point for sharpness I'd go with a non solvent type of film developer formula. Beutlers, an acutance formula uses 5 grms of sulfite! 1 Metol 5 Sulf 5.85 Carb 2.5 K/io Now run that Efke in some of this, Willi B's fireball juice and you'll really have film as the limiting point for your sharpness. Assuming of course you've sand-bagged your tripod! Or Rodinal, FX1, Neofin Blue; or even PMK, Dilute Dk-50, or FG7 with no sulfite. By the way in the Film Developing Cookbook, as far as categories of high definition developers go (page 55) Anchell/Troop say when grouping Xtol in catagory 4 with D76, FX 15, D23, Microdol-x, Perceptol all diluted 1:3 or 1:4: "Kodak XTOL 1:3 is a special case, offering a speed increase at that dilution and usually high sharpness for a solvent developer" I don't agree on the speed increase by the way. Mark Rabiner Portland, Oregon USA http://www.markrabiner.com - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html