I think I understand you, thanks.
I would have to read more Stark to see if I fully understand the sub pixel star image problem.
Quote:
Originally Posted by Merlin66
Ray,
""a star covering many pixels can guide down to a small fraction of a pixel"
That's the issue I see with smaller finder guiders, short focal length.
With "standard" guide cameras the star image (say, 2 arcsec seeing) will not cover multiple pixels unless it's allowed to drift about - which defeats the purpose.
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