Mounting Lodestar on finder guider?

[michaelmorris]

I'm just getting to grips with a (new to me) Lodestar guide camera. I want to use it with a 9 x 50 mm finder/guider I recently bought second hand. The finder/guider has a T2 adaptor on the back. However, the Lodestar won't come to focus at a position where my current T2 to 1.25" adaptor will grip the camera satisfactorily, so I want a new 1.25" to T2 adaptor.  What do you use?  Are rotating helical focusers for fine adjustment of focus too much of a pain?

Thanks

[Tinker1947]

The Lodestar will attach to the rear of the finder guider, it needs a adapter sold by modern astronomy focus it achieved by moving the front element on the finder guider....

http://www.modernastronomy.com/accessories.html#accAdapters

[michaelmorris]

The finder already has the finder to T2 adaptor. My enquiry is about T2 to 1.25" adaptors.

[Tinker1947]

The Viewing end of the Finder Guider unscrews and the Adapter screws in there is no T2 Adapter involved, the Adapter required need to have the right tread to screw into the Finder Scope, my Skywatcher and Celsteron Finders had different threads but both had the C Male Thread to screw the Lodestar onto, in my picture the Lodestar also has a C Thread extension....

I think this is the C Mount Extension..

http://www.firstlightoptics.com/adapters/low-profile-125-nosepiece-c-threads.html

[libraryman]

I found that my QHY5l-ii would not come to focus, I made a sleeve that fitted over the end of the finder tube..in effect extending the length, into this I fitted a 2" to 1.25" adapter and then the camera..it works a treat but I did have access to a lathe.

Ray

[Tinker1947]

The normal method is adjusting the front Lens of the guide scope with the C Mount Extension fitted i could just get it there...

[libraryman]

Agreed...my finder is the Celestron 7x50...I did not realise adapters to fit my camera C extention were available until this thread...thanks.

However now that ive completed my mod, i feel it gives me more focus and positional options and it saved me £28.00.

Though the adapter does look tidier..

Ray

[michael.h.f.wilkinson]

The finder already has the finder to T2 adaptor. My enquiry is about T2 to 1.25" adaptors.

You mean something like this:

http://www.teleskop-express.de/shop/product_info.php/language/en/info/p209_Reduzierung-von-T2-auf-1-25----aufgesetztes-T2-Gewinde---kurz.html

There is also a longer version:

http://www.teleskop-express.de/shop/product_info.php/info/p210_Reduzierung-von-T2-auf-1-25----aufgesetztes-T2-Gewinde---lang.html

[Tinker1947]

This is the Modern Astronomy Adapter, sorry about the dust..........

 

[michaelmorris]

You mean something like this:

http://www.teleskop-express.de/shop/product_info.php/language/en/info/p209_Reduzierung-von-T2-auf-1-25----aufgesetztes-T2-Gewinde---kurz.html

There is also a longer version:

http://www.teleskop-express.de/shop/product_info.php/info/p210_Reduzierung-von-T2-auf-1-25----aufgesetztes-T2-Gewinde---lang.html

Yes, those are the sorts of things I'm asking about.

Thanks

[michaelmorris]

The normal method is adjusting the front Lens of the guide scope with the C Mount Extension fitted i could just get it there...

Thanks, I didn't realise that the Lodestar had a C mount thread on it.  I'll give that a go.

[terrym2002uk]

If you need to get more back focus, unscrew the barlow lens from a 1.25" barlow and use that as an extension tube. Thats how i mount my lodestar on my orion 50mm finder/guider.