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Re: [Rollei] Tripod threads
- Subject: Re: [Rollei] Tripod threads
- From: Jerry Lehrer <jerryleh >
- Date: Mon, 24 Sep 2001 20:22:19 -0700
- References: <B7D489B4.1377C%bob >
Somehow I feel that I didn't quite get my message across.
NONE of my cameras or any accessory that has a tripod
socket has Whitworth threads. Including the pre-WW 2
cameras. Even the newest camera in my arsenal, a Hasselblad
that has 1/4 and 3/8 sockets shows a US 60 degree thread
form in both sockets.
Marc James Small wrote:
> At 04:44 PM 9/24/01 -0700, Jerry Lehrer wrote:
> >Today I checked all my camera tripod sockets and bushings
> >on an optical comparator and I get the following results from
> >all of them:
> > 1/4-20 tpi. 60 +/-2 degree angle
> > 3/8-16 tpi 60 +/-2 degree angle
> >None exhibited a 55 degree thread form.
> Thanks, Jerry. This makes sense. I suspect the International Standard
> adopted in 1889 WAS the Whitworth thread and that this was used for some
> years -- Whitworth DID remain the norm in scientific apparatus until the
> Second World War but, outside of that, was never readily available in the
> US. I suspect the US guys simply ignored the standard somewhere along the
> way -- say, the 1920's? -- and went their way with UNC and its 60º slope.
> But I haven't a doubt that the original standard -- and, probably, the
> current standard! -- calls for BSW.
> msmall FAX: +540/343-7315
> Cha robh bàs fir gun ghràs fir!