Easier said than done for some formats. I like whole-plate 6.5x8.5 and it seems most of the extant holders were originally made for glass plates. The format decreased in popularity in the early part of the 20th century and sheet film holders in that size are hard to come by especially for some camera models. There wasn't a standard for whole-plate in that era so one might have several different sizes of plate holders of the same format for different cameras, yet they all take the same size film sheaths. I wish I had about 20 more whole-plate inserts.
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