I’ve recently obtained a used SkyWatcher 127mm Mak. I’m planning on using it for lunar and planetary visual from home in the city. I already have a selection of 2” eyepieces I use on other scopes, and plan on using them on the Mak. I’ll be mounting the scope on my Vixen Porta II mount.
The visual back that came with the scope supports 2” diagonals, but has no compression ring. I’d like to replace it with something as short as possible (just long enough to hold a 2” diagonal), but solid enough to support the diagonal and heavy 2” eyepieces. I want it to have a compression ring to hold the diagonal.
The visual back seems to be attached with the SkyWatcher Mak-specific thread. I’ve measured it to around 65mm in diameter on the scope. I’ve searched this forum and found references to an adapter that would convert that thread to the SCT standard thread:
My understanding is that this would allow me to attach a 2” visual back such as this one:
Is that correct? I’m unsure the adapter is the correct part I need. The diameter of the thread on the back of my Mak is bigger than the diameter of the SCT standard thread, but the adapter seems to make the thread diameter bigger.
I’ve also found a reference to this visual back:
This seems to be exactly what I want in one single part. But I’ve failed to find a North American distributor for it.
I’d like some input on how to achieve my objective of replacing the visual back that came with the scope with one that can hold my 2” diagonal firmly. I’m open to other options.