Eyepiece Calculator

Aperture  Exit Pupil 
Objective Focal Length  FOV (Linear) 
Eyepiece Focal Length  Magnitude Limit 
Apparent FOV  Total Number of Stars Visible 
Magnification  Number of Stars Visible in FOV 
FOV  How many optical tubes 
F Ratio 
 
(C) 2007 Todd D. Vance