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I wanted long exposures without resorting to f240, so I asked chatgpt to make me a developer that reduced the speed of film a lot. Came up with a phenidone based developer. It said it would make fp4+ drop down to about 12 iso. Metered @ 12 iso I got a 17.5 min exposure @ f64, and I got a negative so thin you can only see it in the right lighting. Scanned "fine", but contact printing times would likely be far too short to make a print from it.
Doing my next test exposure for 3.5 hours. Same scene, but the light will gradually fade from the window I'm using to photograph the image, so part of that time is to compensate for that. It metered at like 16 minutes, but I gave it an extra stop just for fun. 30 mins = 3.5 hour exposure with reciprocity.
Should be interesting to see if I can get the extra density I want from the negative.
Sorry about the dust and shit. This is strictly a test shot. I think I figured out where it's coming.
