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Hi Jack,
The 120 is fine as a guide cam (I use the mono version on a zwo guidescope).....I actually started with the asi036!
Guide scope quality isn’t that important so don’t spend a fortune when starting out. Initially I was guiding with a second hand beat up Australian geographic tabletop reflector (yes, reflector!).......was fine to get me going on the guiding front and learn the ropes. Cost me nothing......I found it in my nephews toy box and it was initially connected to my imaging scope with a couple tech screws. Hahahahaha
As amateur as it sounds it worked fine and gave acceptable guiding at 750mm imaging length.
I’m just up the road from you, drop me a message if you want to chat
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