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 . . .