Does Reciprocity for long exposures keep going on - forever?
Or does it go "so far" and then just kind of stop. Not going past a certain point and after that it is basically done?
Asking after looking at some 8x10 negatives and prints that were done with 2-8 hour exposures. Very low light in a soon to be demolished jail. One 40 watt light was the source and it had been blocked heavily with wet toilet paper, apparently so the resident could sleep. Very little light in the place as the hallways were single fluorescents widely spaced.
The photographer metered the scene and the reciprocity chart didn't go long enough so he guessed and left to use smaller formats in other cellblocks while these exposures cooked. Per him, every one turned out well, printable and no problems along the way.
The negative looks very good and the prints even better.
So, exposures of many minutes to hours - some "slop factor" in the mix. Not like 1/125 second at all.
Any information about very long exposures and reciprocity you can direct me to?
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