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Greg, I’ve had some success at 200mm, it’s not that hard to get 2m unguided shots with the Star Adventurer. I recently started guiding and I rejected 2 out of 65 subs of the first guided target.
I guess what I’m trying to say is, it’s not that hard to get the SA running nicely. I’d imagine at 30 second subs, you’d be rocking and rolling in minutes.
Regarding the polar scope, I’m not sure how you’d determine accuracy, but if you release the RA clutch and spin it around, you’d soon see whether the SCP trapezium is well positioned.
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