This topic came up fairly recently on BF. To answer it, I checked my thread on tripod head with a set of thread gauges. I have a 1/4" Whitworth on at least one of my heads. A 1/4" UNC male thread will mate with a female bush in the base of a camera too but it's not a snug a fit as the 1/4"W thread gauge I tried, at least not on the camera I tried it on. I'll have to check the others (heads and cameras) to see.
Duncan
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