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Orion Apex 102mm Mak --- Rear Threads

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#1 whizbang

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Posted 11 August 2020 - 05:13 AM

Does the Orion 102mm Mak have 1.375" or M44.5 rear threads?  I would like to buy an adapter for standard 2" SCT threads.

 

Thanks!



#2 gene 4181

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Posted 11 August 2020 - 07:23 AM

 You'll need the Mak too SCT thread adapter from Scopestuff ... Part SMSA  44.5 mm to SCT thread adapter  Orion used too sell it  also  but haven't seen it in awhile there


Edited by gene 4181, 11 August 2020 - 07:29 AM.


#3 petert913

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Posted 11 August 2020 - 08:19 AM

I would think there will be some vignetting using a 2" set up.  The diameter of the internal baffle is quite small in the 102mm Mak.



#4 whizbang

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Posted 11 August 2020 - 08:25 AM

Got it.  Thanks!!



#5 life_is_awsome

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Posted 11 August 2020 - 09:52 AM

It is an metric thread, M45x1. I own this scope, too. Hence the lightpath is diverging after the barlowing secondary, the useful Fieldstop increases with the Focal distance you use, as the effective sytem focal lengh will do, too. The true field of view does get a litle bit bigger by doing so, but you get more and more visible vignetting to the last maybe 5-10% of illuminated field. I use it with a baader zeiss T2 diagonal and with this big 2" 45° amici sold by TS with 31mm aperture. with the Baader you get around 28mm useful field, perfect match for a hyperion 24. Using the Amici with its whopping 110mm lightpath, you get an 26mm SWA fully illuminated, this eyepiece has 32mm field stop. So if you use it above 100mm lightpath, 2" does start to make sense with this scope. But no matter what you are doing, at 1.6 degree true field you will run into an hard limit.

These are the two pieces you will need to access the whole big world of T2

https://www.teleskop...fotografie.html

https://www.teleskop...n-Telescop.html

 

As always, clear skies everybody


Edited by life_is_awsome, 11 August 2020 - 09:53 AM.



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