Before asking my questions, I want to present the reason for my dilemma.
I recently purchased a nice binoviewer that appears to lack a way to add a Baader Glasspath Corrector between the binoviewer and a T-2 prism diagonal. On the telescope side of the "Zeiss" binoviewer, the metal base ring of a Baader Quick Changer does not attach directly to the binoviewer body. Instead, it is held firmly in place by an inner ring that screws into the binoviewer body, thereby holding the Quick Changer base in place.
There are no threads inside the steel base of the Quick Changer, and even if there were, the black metal ring doesn't permit a GPC to be inserted into the opening of the base of the quick changer, as the black ring is about the same diameter as the GPC.
I thought I would prefer this arrangement: Binoviewer > Baader Glasspath Corrector > T-2 Quick Changer > T-2 prism > T-2 to 2” nose piece > telescope. But I have been advised that the only way to use a Baader GPC with my binoviewer is to use this arrangement: Binoviewer > Quick Changer > T-2 prism diagonal > GPC inside a T-2 to 1.25” nosepiece adapter > telescope.
This is my problem: my primary interest is viewing the Moon and Planets. I want to use the binoviewer exclusively with my 2700mm focal length Mak. I'd also like to use a pair of Morpheus 17.5mm eps. I'll be able to reach focus with the Bino-system, as described in my preferred arrangement (above) without using any GPCs. I will get a base magnification of approx. 156x, which would be ideal for a lot of my viewing. However, there will be times that I would like to increase the magnification to about 200x (with a 1.25x GPC) and to about 260x (with a 1.7x GPC). But those options are apparently off the table with my particular binoviewer.
If, instead of using GPCs, I could use a BARCON or BARADV screwed into a 2" nosepiece, but that would yield a magnification of approximately 400x, and that is more magnification than I want. I do not enjoy viewing with tiny exit pupils. So I was thinking of buying a 1.25x and a 1.7x GPC, attaching each to it's own T-2 to 1.25" nosepiece adapter. In that case, I'd be using arrangement #2 (Binoviewer > Quick Changer > T-2 prism diagonal > GPC inside a T-2 to 1.25” nosepiece > telescope.)
So (finally) here are my questions:
1) Will the GPCs work using them in the above chain of alignment?
2) If they will work, by placing the GPCs in front the T-2 prism, closer to the telescope - how much more magnification (and decrease in f.o.v.) will those 2 GPCs yield?
3) Instead of using a GPC or a Barlow, would I be better off buying a second pair of shorter FL eyepieces to achieve higher magnification?
4) Are there other solutions you can suggest?
Thanks in advance.
Edited by elwaine, 18 September 2019 - 05:31 PM.