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As citivolus says the Astrocalculator is the way to go. I would be lost without it.
or you can use this forumula
width of FOV= w/F x 3438 arcmin
where w = the width of your chip in mm, F = the focal length of you scope in millimeters
height of FOV = h/F X3438 arcmin
where h= height of chip im mm.
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