4 replies to this topic

[brownrb1]

Hi,

I'm assembling a Star'Ex spectrograph and can't figure out how to connect my ZWO178mm camera to the guiding module. There are M42 male threads coming out of the guiding module and my camera will connect directly, but I need to adjust the distance for focusing. I have a 1 3/4" x 1 1/4" i.d. fitting that takes the 1 1'4" camera adapter but I can't figure how to connect to male M42 threads. Any ideas on how to do this (attached is a photo)?

Thanks

Dick

[JCDAstro]

Search Amazon for an M42 Variable Extension Tube (or maybe Ring)...its got M42 threads on both slides and tube that is threaded to change spacing precisely.  They have different lengths, also have more options from Baader and the like at the Astroshops online.  

 

That might be what you need here rather than that gold extension piece you have there in the picture.

[JCDAstro]

I just also thought about the fact that they sell M42 threaded Helical focusers (with an end that accepts eyepieces or camera nose pieces), then you can easily adjust the focus (rather than have it locked down and somewhat difficult to adjust with the variable locking extension tube).

[brownrb1]

Thanks for the info-I ordered one

Dick

[robin_astro]

Yes the instructions for the StarEx guider show a helical focuser

http://www.astrosurf...x-stars-en.html

 

Robin