[rollei_list] Re: ?? True Sizes of Tripod Mounting Holes

Regarding your Praktiflex comment, I found this on the
photonotes.org website:

Tripod mount.

    A threaded socket in the base of most cameras to
which a screw can be attached.

These sockets are used to attach camera bodies and
lenses to tripod heads, flash brackets, monopods, etc.
They come in two sizes - 1/4 inch (with 20 threads per
inch pitch, or 1/4-20) for smaller cameras such as
nearly all 35mm cameras and 3/8 inch (with 16 threads
per inch pitch, or 3/8-16) for larger cameras. Even
most European and Japanese manufacturers use these
non-metric sizes for historical reasons, though tripod
mounts with incompatible thread counts are sometimes
found on European and Russian equipment.

cf. flash bracket, monopod, studio pedestal, tripod,
tripod collar.

John
--- Peter J Nebergall <iusar4s@xxxxxxxx> wrote:

> Thank you for clarifying this point!  Ever since my
> old Praktiflex (in
> 1966!)  I've wondered why my many 3/8 equipped
> pieces didn't work on 3/8
> thread......
> 
> Peter Nebergall
> 
> On Mon, 27 Aug 2007 16:12:55 -0700 (PDT) John Jensen
> <jwjensen356@xxxxxxxxxxxxx> writes:
> > Marc, I don't see that there is an equivalence to
> the
> > Unified thread and to a standard metric thread. 
> For
> > the 3/8-16 thread the pitch distance is 0.0625". 
> This
> > is equal to 1.5875 mm.  The 3/8" (0.375") thread
> size
> > is slightly smaller than an M10 which has a thread
> > size of 0.3937" and a pitch of 1.5 mm.
> > 
> > If there were a hypothetical M9.5 thread (0.374")
> with
> > a 1.5 mm pitch, it would come quite close to
> matching
> > the 3/8-16 thread size.  But I don't see that
> there is
> > such an animal.
> > 
> > John
> > 
> > --- Marc James Small <marcsmall@xxxxxxxxxxx>
> wrote:
> > 
> > > I would like to know the true specifications of 
> > > the two common tripod threads.  I believe that 
> > > the larger thread has a Metric measuremetn which
> 
> > > works with an SAE thread.  I would appreciate 
> > > your help in providing the SAE and Metric 
> > > measurements for both the smaller and the larger
> 
> > > mounts.  Extra points to those who can identify 
> > > the actual pitch of the thread (DIN, SAE, or
> > > Whitworth, or whatever).
> > > 
> > > Enquiring Camera Lore Fanatics Want to Know!
> > > 
> > > Marc
> > > 
> > > 
> > > 
> > > msmall@xxxxxxxxxxxx
> > > Cha robh bàs fir gun ghràs fir!
> > > 
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