Keith (Dorset) wrote:
I didn't see the original post on this subject, however for 35mm cameras,
and at least some of the old (120) folding cameras, it has been 1/4 inch
Whitworth for decades.

There was / is a larger size in use - of a broader diameter, for use with
heavier gear (medium and large format).

Manfrotto use this to attach heads to tripods on their high-spec tripods
- hence the reason for the question. You're right, 1/4" whit is much
more common - it's even used on some webcams!

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