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I used to rate seeing by star twinkle with the naked eye. But now I go by how much the planet on the laptop is going in & out of focus. I have seen very little star twinkle naked eye & a terrible view on the laptop at the same time, not sure what to make of that?
Yes, simply get a medium bright star on the laptop & put it slightly out of focus just like you would in the eyepice visually. I do this all the time to test collimation. Make sure the star is exactly in the centre of the FOV before you decide if its out of collimation first though. No easy task for you with no tracking.
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