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Image Scale or Pixel Scale
Camera pixel size uM x 206.3 / imaging scope focal length mm = Image Scale ( expressed in arc sec per pixel )
A) Main imaging Image scale
Imaging camera pixel size x 206.3 / imaging scope focal length = ?? arc sec per pixel
B) Guiding Image Scale
Guide camera pixel size x 206.3 / guide scope focal length = ?? arc sec per pixel
Imaging to Guiding Image Scale Ratio
B to A
General rule of thumb for acceptable image scale when guiding is 5:1 or lower
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