Re: Semi OT: Heavy Tripod Head Support

[Lon Williamson]

Which cameras use 3/8?  Do the Pentax 645 or 6x7 use them?
Hassleblad?  4x5 view cameras?
William Robb wrote, in part:

Did anyone ever figure out if Les Bogen had a 1/4x20 arse or a
3/8x20?
I've always been curious.