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Hi Barry (or if any one else knows)
I don't understand 'image scale', so i have supplied a few facts about my equipment:
I have imaged with both scopes, and both seem to work fine.
Camera: 13.4 X 17.7mm sensor. 3.8um pixel size.
Scope 1:
85mm refractor.
f/6.6
FOV 82 X 108 arcmin.
Resolving power 1.36 arcsec.
Image scale 1.4 arcsec/pixel
Scope 2:
304mm reflector.
f/5
FOV 30 X 40 arcmin.
Resolving power 0.45 arcsec
Image scale 0.51 arcsec/pixel
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