What is the thread on the rear of a TAL 100RS focuser for

[Uplooker]

Hi All,

Could someone please tell me what the thread is for on the rear of the focuser assembly.

To clarify, it is located on the 2" focuser tube that remains having removed the 1.25" reduction collar. It is on the RHS of the picture.

What size thread is it.

I am sure someone will come along with the answer and I will feel a complete numpty for not having realised what it is

Please put me out of my misery.

Ian

[daz]

I would think it's something like an SCT thread or T-thread?

The latter would allow direct connection to a camera fitted with a T-adapter, the former to use SCT accessories

I don't know TAL kit so could be well wide here....

[AndyH]

I believe it's M56x1. I haven't measured it myself, but have read on more than one occasion, that it's this size.

[AndyH]

I think you can mount one of these on the thread........... (using that shop as an example)

http://www.teleskop-express.de/shop/advanced_search_result.php?keywords=M56&suchdas=OK

I think many of the skywatcher n celestron refractors have this thread also? At least that's what I found when I put M56 into the SGL search.

[Astro_Baby]

On mine the T thread is supplied on a separate ring that gets inserted into the focuser.

The ones on the rear of the focus tube ai have no idea about. Just ignored them

[AndyH]

On mine the T thread is supplied on a separate ring that gets inserted into the focuser.

The ones on the rear of the focus tube ai have no idea about. Just ignored them

I'd guess that the thread on the end of the 2"-1.25" adapter is M42x1 and there's a M42x1-M42x0.75 adapter ring included?

[Gary70]

It is for T ring to attach. http://www.npzoptics.com/files/tal-100RS,125R.pdf see page 19 of this.

[AndyH]

My humble attempt at communicating in Russian got me this from Yuri, at the factory...........

QUOTE (AndyH @ 30 Jan 2013, 07:36) Привет.

Какой размер резьбы на внешней стороне Крэйфорд фокусирующее трубки? Для чего он используется?

Спасибо,

Andy.

механизмом фокусировки имеет резьбу M56h1? Почему? для чего?

Спасибо,

Andy.

QUOTE (AndyH @ 30 Jan 2013, 08:37) QUOTE (AndyH @ 30 Jan 2013, 07:36) Hey.

What size thread on the outside of the Crayford focusing tube? What is it used?

Thank you,

Andy.

Focusing is threaded M56h1? Why? for what?

Thank you,

Andy.

It is true, the thread on the end of the focusing tube M56h1 - designed for attachment - external guides, converters focus etc.

[AndyH]

By the way the english dot com version of NPZ is down at the mo. Use the Russian dot ru version at

http://www.npzoptics.ru/

then use an online translator to look through it.

[Uplooker]

Thank you very much for all of the replies and information therein.

Ian