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I can get 2 min exposures with no guiding - and round stars.
I'm on a wedge @F10.
I'm pretty sure from that that my PA is pretty good, my biggest worries seem to be from the poor PE and backlash so my balance is critical and guiding is variable according to the portion of sky I'm doing.
This was my setup test without guiding 2 mins single exposure - no tweaks
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