Bill, I don't know if I can give you specifics, but my longest successful exposure has been 47 days. I tried an exposure in a basement area for ten days and the result was too faint so i put the date I began the next exposure and kind of forgot about my camera for a while. When I remembered it, 47 days had passed and the resulting paper negative wasn't bad. Rusty
<< Bill Erickson wrote: I'm planning an image of a dark corner in an old building. The exposure calculates out to about five days with a paper negative. At what exposure time does one begin to run into reciprocity failure with paper, and what are the parameters? >>
