Not a single starry night since opening the thread. ...
I've sent back the 70mm Scopes.
Now I'm pursuing 2 paths.
* One is still a binoscope, now with 2 60mm Travelscopes.
I've emailed Celestron Germany (Baader) for the exact max tube diameter.
If that diameter is less than 7cm it would fit my IPD.
Then I'd order 2 at Amazon (thank GOD for free returns in Germany!)
and test whether I can mount them parallel and stable! enough to work as binoviewer.
* The second path is now the binoviewer.
Baader's Maxbright would be first choice if a 2nd hand comes up of the now discontinued model.
My 2nd choice would be the Arcturus because I found 1 really okay review about it on the web. And it's totally cheap: 165€ new here in ebay.de, sold as "
BST Starguider Binoviewer. Comes with Barlow 3x and 1.5x.
No EP.
The advantage of a binoviewer for me is the diopter thingy.
I need that because my eye diopter difference is 2.5.
Don't know whether this particular requirement can be fulfilled by my crude binoscope setup. Possibly only by sacrificing the true 2-eye-perception?
If binoviewer then a scope is necessary. Somehow I am fixated on a Mak design with bigger aperture than my mirror lens 500/6.3. That one has a ~79mm aperture.
Except for 2 Mak models in the 80-90mm range, all seem to have a focal ratio of 13 or thereabouts.
That must be very dim indeed... especially with a binoviewer...
The 2 faster Maks, Omegon Mightymak 90 and Kasai Pico-8, have f/11 - still very dim ...
But there is still my Samyang / Walimex / Bower 500/6.3 ....
How about I adapt that lens to be my scope for a binoviewer?
At least temporarily?