I have a dilemma I'm trying to solve without going broke.
I have a RASA 11 V2, with ASI6200MC-Pro and ASI6200MM-Pro cameras.
For the mono camera, I use the Baader UFC system with 50x50mm square Baader f/2 HighSpeed filters. Narrowband filters on the RASA really should have a shifted bandpass, otherwise you lose too much light with "normal speed" filters. It has worked great, except Baader still does not have the OIII filter in stock so this camera and filter setup has been next to useless. Well, that's too harsh -- I have been capturing Ha and SII data, but will have to supplement it with OIII data next year (since my targets are drifting out of season).
For the OSC camera, I have the Celestron Light Pollution Imaging Filter for RASA. I believe this filter may actually be made by Astrodon, but that could have been a rumor. Anyway, it seems to be a great filter -- it handles my Bortle 6 skies well, and the colors it produces are pretty natural. The problem that I have is the Baader UFC telescope adapter is not built to Celestron's custom adapter specs. It sits flat on the lens group instead of having negative space, so it ends up sitting on top of the Celestron filter ring screwed into the RASA. This is a horrible oversight, and it means I cannot use UFC with this filter because it introduces spacing and tilt issues.
In a simple world, I would just sell the Celestron filter (as good as it is) and buy a replacement 50x50mm filter for the UFC. However, I don't see any of those available (such as the Triad Ultra Quadband, which only appears to be available in 65mm square sizes), plus they are not band-shifted to work with ultra-fast optical systems like the RASA. Am I missing some good options?
I've looked into various other solutions. I started with PreciseParts.com but I need the solution to be spacing-adjustable. Then I came up with a PreciseParts adapter that connects to the Baader M68 Varilock, but then that needs an M68 gender changer to the ZWO 68mm tilt adapter that I can't seem to find anywhere. I could just adapt it to the existing m54 tilt adapter I suppose, but I was hoping to keep everything M68.
I've also looked into some very interesting custom-engineered solutions that also allow precise tilt and spacing adjustment via micrometers... but they are expensive and I'd rather not spend more for an adapter than the filter I'm trying to save.
Anyway, is there some option out there that I am missing? Other than selling the OSC, of course (I love my mono, but with the RASA able to capture so much light it makes OSC cameras much more practical, especially since I can't mount a filter wheel).
Thanks in a advance.