----- Original Message -----
Sent: Wednesday, February 11, 2004 8:50 PM
Subject: Re: [M]: RE: Opposite of a T Adapter


> For anyone having trouble making sense of threads, Roger Hamlett recently
> added a text file to the SCT-user yahoo group that summarizes many of the
> threads commonly used on astronomical/imaging equipment.
> -John
Thanks John.
I have just ammended the file with a couple of comments and 'extras' sent by
other posters. I am hoping that other people who come across different
threads, may feel inspired to send me the details, so that the list can
'grow' to include most threads met on the scopes.

Best Wishes

> >Date: Wed, 11 Feb 2004 09:13:11 -0600
> >
> >The C thread is 1" 32 TPI. It is an English thread.
> >The T thread is 42 mm 0.75 pitch. It is metric.
> >As I recall, the Pentax thread is like the old Leica screw mount thread
> >which is 42 mm 1.0 pitch.
> >
> >There are also a C bayonet standard and a small standard thread for web
> >cams
> >and the like.
> >
> >Too many standards! You have to be careful.
> >
> >Doc G
>
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