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Nik
These are my best guiding figures in PHD2
Imaging the Centaurus A galaxy with 4 minute subs
This is about the best guiding I can do with a big scope 8” f5 newt
Seeing conditions mostly determine how well you guide
Make sure you set your graph to read out arc seconds ( “ ) instead of pixels
A general gauge in guiding below -
Bad guiding + 2 arc sec
Average guiding 1.5 to 1.8 arc sec
Good guiding 1.0 to 1.5 arc sec
Excellent guiding 0.50 to 1.0 arc sec
Cheers
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