I tried here to put only formulas without any trigonometry.
As angles are very small accuracy is good.
So you can apply this formulas with only X and /.
ARCSEC ANGLE SEEN:
ARCSEC = SIZE OF OBJECT X 206000
Size and distance in same unit.
Exemple: Moon: size 3476 km ,
distance : 384000 km
Angle : 1864 arcsec, 31,08 mn (/60)
RESOLUTION IN SECONDES BY PIXEL:
Resolution= 206 X pixel in microns / focal in mm
Pixels of my MX916 are 11 microns wide and my focal is 1575 mm
206x11/1575= 1,44 arcsec by pixel. It is good without any wind !
FIELD OF VIEW
Field in arcmn = 3438 X ccd size mm / focal in mm
My MX 916 are 8,6 mm wide, my
focal is 1575 mm , so i have field of view of 18,77 minutes.