I had the old 120mm for guiding and it was a pain. Very sensitive to everything. Worked better from a USB hub and requires perfect focus to see anything so I think speed of transfer is an issue. I could not see the stars it was guiding with on the screen often but you could see it was working.
The newer Asi120mms I have now is much better. Some software seems to randomly go into weird exposure mode with looping on ASI cameras. Setting the exposure exactly for looping seems critical.
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