Chris wrote: > While waiting for an appointment I pulled out my alt books for a little > reading. In Christopher James's book page 136 he says that a range of > 1.8 is needed for Mike Ware's New Cyanotype formula. He say's "Mike > advises extending from base+fog (0.2) to a D-maz of 2.0 or more. This is > achieved by "overdeveloping" the negative to the extent of 70% to 80%". > > Your development time is already beyond 100% but you only have a density > of 1.36. I would think this would tell me that there is something else > wrong. Its good to know how they are measuring their density range. I > didn't know if it was base+fog to D-max or shadow detail to highlight > detail. Looks like from this book its the former.
Yes, I had never thought of measuring it that way. I always measure it from shadow density to highlight density, following Dick Arendtz. > > Now that I know this I wonder if your following zone system measurement > procedures and only reading shadows with detail and highlights with > details. If that's the case then you might have perfect negatives > already since it seems that alternative workers read everything not just > the details ;-) In the past my perfect negatives for cyanotype, made with a lens camera, had a density range of about 1.6. This was the difference between the "important" shadow areas and the highlights. So I have maintained that way of working. I guess it doesn't matter which way you measure the difference, as long as you know what works for you and you are consistent. What works for me is, a difference of 1.6 between the shadows and the highlights. I ignore the base+fog measurement. However it seems that it might be important to know what it is for different films, as a dense base+fog might explain why HP5+ for example is hard to get thin enough in the shadows. --shannon > -- > -- > Chris Peregoy | http://www.gl.umbc.edu/~peregoy | http://imda.umbc.edu/ > > > _______________________________________________ > Post to the list as PLAIN TEXT only - no HTML > Pinhole-Discussion mailing list > Pinhole-Discussion@p at ??????? > unsubscribe or change your account at > http://www.???????/discussion/
