That custom guide camera holder is similar to what I use. I have a Televue 2X barlow holder installed in the MMOAG guidescope holder.
You can get eyepiece focus rings from Scope Stuff that you can fix in place when it is in focus so next time it slides in and stops at the spot where its in focus.
Although I manually focus my guide camera by sliding it in or out slightly. A bit of a pain but not too hard.
NIR guiding sounds interesting and the real time autofocus sounds appealling.
Greg.
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