Quote:
Originally Posted by mithrandir
It isn't that critical that the guide scope and imaging scope have parallel axes. If they don't your polar alignment has to be better. I've seen posts elsewhere where they got good results for high declination targets with the guide scope axis 10-15 deg off the imaging scope.
The closer you get to the poles the harder it is to guide because there is less pixel movement in RA, so having the guide scope pointed away means any tracking error is easier to pick up. However it also puts the centre of any field rotation where the guide star is located which may be outside your imaging area, which is why we get back to needing good polar align.
Even then you might have to limit the exposure time.
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What if your guidescope is pointing west of the SCP but imaging to the east?