I have sold 5-5x7 negative carriers in the last month or so, trying to decide whether to make another batch. Keith Canham orders different varieties of 5x7 film with some regularity(including color neg), and I believe it's a stock size for Ilford (but would be available in their annual ULF and weird sizes order if not).
PS: Attn Dugan: I shoot 3.25"x4.25" and know several other shooters who do as well. The Super D in that size is SO manageable compared to the 4x5, and I have a 3x4 Speed that make a very compact kit even with a nice stack of holders. I even made a reducing back for my 8x10 for "Quarter Plate" aka 3.25 x 4.25. Film through Ilford, once a year, VERY affordable !
Back to 5x7, Calumet SF used to stock 5x7 Tri-X for years after I left since I planted "the bug" in the system, it even got mentioned on here way back when.
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