Several years ago, I bought a 51 Redcat version 1. I use it for visually only. I don't do AP.
It has excellent optics with a flat field. But the only diagonal that will work with the 51 Redcat is the proprietary Amici diagonal. I'd like to adapt the scope to accept a standard 1.25" mirror or prism diagonal. Or even a standard Amici diagonal, if that's what I want. How do I do this?
I'm not sure what threading the rear port has. It isn't 48mm. I've heard that it is 55mm or 56mm. I can't find any specs on the threading online. If it's out there, I haven't found it. Williams Optics and their vendors talk about everything but the threading on the rear port.
I need a ring adapter with male "whatever-it-is" threading on one side and male T2 threading on the other. I'd like to connect my Baader mirror or prism diagonals directly to the rear of the 51 Redcat. The threading on both of these diagonals is T2.
The 51 Redcat has a rotatable visual back and the scope can be rotated in the ring. So no problem if the diagonal isn't lined up correctly when I connect it.
The 51 Redcat 1 included a 48mm adapter, but it is too long. If I connect a diagonal to this adapter, eyepieces won't come to focus. There is not enough back focus. Yeah, an astrograph with not enough back focus for visual. Don't they usually have too much? That's my experience with Newt astrographs, anyway.
So does anyone know what threading is on the back of the 51 Redcat version 1? What ring adapter can I use to connect a 1.25" diagonal which has female T2 threading?
Edited by Sarkikos, 17 August 2022 - 07:47 PM.