In article ,
Mike Clarke wrote:
There was a discussion on here maybe earlier this year, maybe last
year about whether the thread on a tripod/camera was 1/4-20 Whitworth
or UNC. ISTR we got into discussions about thread angles and somebody
pointed out that Wikipedia was (allegedly) wrong.

Thing is, I can't remember who had the last word, and I can't find the
discussion on Google Groups.

It's Whitworth. I've just fished out one of my ancient cameras that dates
back to the early '50s when the standard was Whitworth.

It may have been in the UK - but the UK was never a major camera maker?

It's held in it's ever-ready case with a screw which goes into the
tripod bush and has a female thread on the bottom for mounting on a
tripod while in the case. The screw fits my current digital camera and
also mates with the screw on my fairly recent tripod. So I'd say that
the current standard is still Whitworth, or is given a generous
clearance so that both Whitworth and UNC will fit.

The other one that hasn't been mentioned is American Coarse.

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