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The Amazing C102F

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#76 jkmccarthy

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Posted 02 January 2024 - 12:23 AM

Reviving this thread. I just bought a c102f. I'm looking for some way to adapt 2" eyepieces. I know the moonlight manual focusers aren't made anymore, but is there any other on the market? Any adapter to use 2" accessories? If anyone can offer any advice I'd really appreciate it.

The suggestion offered here --

 

https://stargazerslo...comment-2702488
 

... to find a 2-inch diagonal with a removable nosepiece and then fashion an adapter with male M53 threads on the drawtube side and XXX threads into the body of the diagonal (in place of the nosepiece) strikes me as having some merit.

 

Photography lens filter male-to-male "gender changer" rings combined with a "step-up" or "step-down" ring might be an alternative to custom fabricating an adaptor ... the drawtube threads are M53 x 0.75mm pitch.

 

        -- Jim

 

EDIT:  Conversely, the caution offered in your other thread here -- https://www.cloudyni...02f/?p=13167192 -- might be a show-stopper unless the difference in optical path length between a prism diagonal vs. a mirror (or dielectric) diagonal is enough to let you squeak by with a prism diagonal ?   Maybe an M42 x 0.75mm threaded Baader "T2 Diagonal" instead of a 2-inch ?  However, I'm not sure about mating a 2-inch eyepiece holder onto the exit of a T2 diagonal ....


Edited by jkmccarthy, 02 January 2024 - 12:30 AM.

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#77 jragsdale

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Posted 05 January 2024 - 11:57 AM

Reviving this thread. I just bought a c102f. I'm looking for some way to adapt 2" eyepieces. I know the moonlight manual focusers aren't made anymore, but is there any other on the market? Any adapter to use 2" accessories? If anyone can offer any advice I'd really appreciate it.

https://www.cloudyni...8#entry12313102

 

It is possible to make a 2" adapter to fit the M53 threaded tube, but the tolerances are VERY tight. It takes a talented machinist to pull it off. Luckily my friend is one of the best on a lathe that I know and made me one; details/pics here:

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#78 HagglePig420

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Posted 07 January 2024 - 11:05 PM

Wow yeah that is tight.. wish I had a machine shop buddy lol.. I talked to that guy Rafael from Raf camera and he makes them. But that's coming from Russia or Eastern Europe I think so that might take a while.. any idea what a machine shop might charge?

#79 jragsdale

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Posted 07 January 2024 - 11:17 PM

Wow yeah that is tight.. wish I had a machine shop buddy lol.. I talked to that guy Rafael from Raf camera and he makes them. But that's coming from Russia or Eastern Europe I think so that might take a while.. any idea what a machine shop might charge?

I would think $75-$100? But depends on the shop, some might tell you it's too thin for them to attempt. Otherwise, a good M53x1 to 2" x 24tpi male to male adapter would be good to thread directly onto a refractor diagonal with the nosepiece removed but you lose rotation ability, which was a deal breaker to me. I prefer my 2" Astro-Physics diagonal as it has a fairly short light path compared to some of my other 2" mirror diagonals.


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