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I accidentally published before adding the edit summary. As noted by someone else, TP is not difficult to find, if you want to pay enough for it. There are many 150 foot rolls out there, and it come up on auction sites often enough. Gah4 (talk) 21:36, 3 October 2019 (UTC)
SO-253
editThere is some question about the highest resolution 35mm film. I believe it is Kodak SO-253, which has the same emulsion as used in holographic plates. This paper includes some of the data sheet, and claims 15,000 cycles/mm. It is also extra sensitive around 630nm, near where some lasers are. It might be ASA 6 at 630nm, but closer to 1 for other parts of the spectrum. Gah4 (talk) 01:04, 3 February 2022 (UTC)