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I use my capture software APT on live view and centre a Star ( say magnitude 2.0 to 2.5 , not too bright ) in the crosshair of my screen , so OTA is centred and tracking on this Star. Then open PHD2 , use the Star profile tool screen to both centre the same Star or guide star ( roughly) and focus it at the same time watching the FWHM and HFD numbers on the dashboard.Once centred and focused , both OTA and Guide scope are aligned close enough.
I do this for both my 8” and 10” newts which have a 60mm guide scopes riding piggyback on the central axis of the Newts using solid dovetail bars and bolts.
I’ve used this method for years and it works fine
Cheers
Martin
PS: I still use my 50mm finderscope in the offset shoe bracket sometimes if needed for 1st Star alignment, but remove it after that for the rest of the night.
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