I echo the need for TMAX-400. For ULF use there is no better film, IMO. It has wide expansioni and contraction potential, low reciprocity failure, and the high EFS is very desirable with ULF work. . TXT-320 and HP5+ can be replaced fairly well by JandC 400, and Ilford FP4+ by Efke PL100, but there is nothing that matches TMAX-400.
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