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JA
I was referring to Image Scale or Pixel Scale as the angular resolution of your image train ( telescope and camera ) expressed in arc sec per pixel
IS or PS = camera pixel size in microns x 206.3 / telescope focal length
General rule of thumb, < 1.0 arc sec per pixel means your oversampling and > 2 arc sec per pixel means your undersampling
Are you referring to FOV of your image train ( telescope and camera ) expressed in arc minutes
FOV = width of camera sensor in mm x 3460 / telescope focal length in mm
Eg: M8 lagoon nebula 90 arc minutes horizontal by 40 arc minutes vertical
Sorry but I don’t quite get what your referring to , excuse my ignorance
ST
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