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- TELESCOPE FORMULA'S Field of View & resolution calculation Magnification = Objective focal length/Eyepiece focal length Magnification = Objective diameter/Exit pupil f/number = Objective focal length/objective diameter Field angle = Eyepiece field stop/Objective focal length It's not always easy to determine the field stop. A more practical way is center a star within about 10 degree of the ...www.stargraham.com/math.html