View Full Version : Home emulsions and reciprocity

04-13-2010, 07:21 AM
I want to coat some plates for my pinhole and wonder about reciprocity. My gelatin-silver-bromide mix is about ISO 3 to start, which will equal long times from the outset.

What about reciprocity? Is that a concern? After how long? How does one go about guessing such things? We get wonderful reciprocity data from the manufacturers, and others who have figured out such things.

I'm too simple for such complicated math . . . :)

Photo Engineer
04-13-2010, 08:47 AM
There is no way to judge reciprocity on these emulsions but it will not be anywhere near as good as current products from Kodak, Ilford and Fuji. Trial and error is the only way to check it out.