I keep buying these adapters, but can't get the one I want.....I need a C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

On Wed, 24 Jun 2020 14:01:36 +0000, Smolley wrote:

I keep buying these adapters, but can't get the one I want.....I need a
C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

In fact just a ring with internal thread and external thread.

On 24/06/2020 15:01, Smolley wrote:
I keep buying these adapters, but can't get the one I want.....I need a C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

I was going to recommend MXV photographic who had most things by way of
obscure adapters and if they didn't could make bespoke ones for a price.
Telescope House is also worth a punt some of the expertise went there.

Otherwise try Edmund scientific optics online catalogue or Surplus Shack
and cross your fingers that you get lucky. Otherwise find a tame local
mechanical engineer with a lathe that can do thread cutting.

--
Regards,
Martin Brown

On Wed, 24 Jun 2020 16:27:40 +0100, Martin Brown wrote:

On 24/06/2020 15:01, Smolley wrote:
I keep buying these adapters, but can't get the one I want.....I need a
C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

I was going to recommend MXV photographic who had most things by way of
obscure adapters and if they didn't could make bespoke ones for a price.
Telescope House is also worth a punt some of the expertise went there.

Otherwise try Edmund scientific optics online catalogue or Surplus Shack
and cross your fingers that you get lucky. Otherwise find a tame local
mechanical engineer with a lathe that can do thread cutting.

Yes, thanks for the suggestions Martin....if I had a lathe I could do it
myself.

Smolley wrote:
Yes, thanks for the suggestions Martin....if I had a lathe I could do it
myself.

3D printer?

Have a look on thingiverse.com first to see if anyone already designed the
right thing. There's lots of adapters already on there.

Theo

On 24/06/2020 16:48, Theo wrote:
Smolley wrote:
Yes, thanks for the suggestions Martin....if I had a lathe I could do it
myself.

3D printer?

Have a look on thingiverse.com first to see if anyone already designed the
right thing. There's lots of adapters already on there.

Yes. My thoughts exactly. The OP may not be aware he can e-mail the
design to various suppliers and they will post the printed article back
to him.

Another Dave
--
Change nospam to techie

On 24/06/2020 16:27, Martin Brown wrote:
On 24/06/2020 15:01, Smolley wrote:
I keep buying these adapters, but can't get the one I want.....I need
a C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

I was going to recommend MXV photographic who had most things by way of
obscure adapters and if they didn't could make bespoke ones for a price.

If you mean the 2nd hand camera shop in Uckfield, they vanished in 2009.

Telescope House is also worth a punt some of the expertise went there.

Otherwise try Edmund scientific optics online catalogue or Surplus Shack
and cross your fingers that you get lucky. Otherwise find a tame local
mechanical engineer with a lathe that can do thread cutting.

On 24/06/2020 20:19, Andrew wrote:
On 24/06/2020 16:27, Martin Brown wrote:
On 24/06/2020 15:01, Smolley wrote:
I keep buying these adapters, but can't get the one I want.....I need
a C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

I was going to recommend MXV photographic who had most things by way
of obscure adapters and if they didn't could make bespoke ones for a
price.

If you mean the 2nd hand camera shop in Uckfield, they vanished in 2009.

Thanks for the info.
You reminded me of another TLA business that might also help: SRB

https://www.srb-photographic.co.uk/

Telescope House is also worth a punt some of the expertise went there.

Otherwise try Edmund scientific optics online catalogue or Surplus
Shack and cross your fingers that you get lucky. Otherwise find a tame
local mechanical engineer with a lathe that can do thread cutting.

--
Regards,
Martin Brown

Smolley wrote:
I keep buying these adapters, but can't get the one I want.....I need a C-
mount ( 0.965" external thread) to (0.913") 23.2mm clamping eye piece
tube. any thoughts....

One thing I would warn about this style of adapter,
is if they're constructed of metal, they leave some
play in the threads, so the item will not jam up
when screwed together.

There is sufficient play, that you cannot get a
good focus from the optics. Maybe you get it set up,
it merely touch the steel part with light pressure,
and your focus is thrown off.

I would suggests some other material choice, such that
when the threads engage, they're more of an interference fit.

I discovered this, from some parts I bought years ago, and
never could get the setup rigid enough for it to keep the
focus I'd applied. A little tap here or there, some incidental
contact and the focus would be off.

Paul

On 24/06/2020 23:57, Paul wrote:

I discovered this, from some parts I bought years ago, and
never could get the setup rigid enough for it to keep the
focus I'd applied. A little tap here or there, some incidental
contact and the focus would be off.

Â*Â* Paul

A spec of locktite on the threads before you do final assembly prevents
there being any tolerance slack. I haven't found that play in the
threads to be much of a problem in any of the optical systems I use.

The old Zenit and Pentax cameras used M42 threaded lenses for instance.

Normally two surfaces get squeezed together by the thread and hold fast.

--
Regards,
Martin Brown