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Image scale or pixel scale of your imaging system ( camera and telescope ) is expressed in arc seconds per pixel and determines whether your system is oversampled or under sampled
Guiding error in PHD2 is normally expressed in arc seconds and determines how many pixels or fraction of a pixel your optical axis ( guide scope or OAG ) is from the centroid of the guide Star
My imaging system has a image scale of 0.88 arc sec per pixel which is oversampled ( usually between 1 and 2 arc sec per pixel is considered the norm but most folk are under sampled which is ok ) Undersampled imaging systems can end up with blocky stars
My guiding error changes night to night and ranges from 1.30 arc seconds to as low as 0.58 arc seconds
So image scale and guiding error don’t really directly relate to each other
Hope some other more learned folk than myself jump in and explain further
Cheers
Martin
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