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ASTRONOMY FORMULAS FOR YOUR
ZHUMELL ECLIPSE TELESCOPE
MAGNIFICATION
To determine the magnification of a telescope and eyepiece
combinantion, divide the telescope focal length be the eye-
piece focal length.
Magnification (x) = Telescope Focal Length (mm)/Eyepiece
Focal Length (mm)
Ex: 20mm Eyepiece with a 114x1000mm telescope.
Magnification = 1000mm/20mm
Magnification = 50x
FOCAL RATIO
To determine the focal ratio of a telescope, divide the focal
length of the telescope by the aperture.
Focal Ratio (f/x)= Telescope Focal Length (mm)/Aperture (mm)
Ex: Focal Ratio of a 114x1000mm telescope.
Focal Ratio (f/x)= 1000mm/114mm
Focal Ratio (f/x)= f/8.8
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