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Magnification of a Telescope

M=(FpFe)
(Fp)Primary Focal Length
(Fe)Eyepiece Focal Length
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The Magnification of a Telescope calculator compute the magnification of a telescope based on the focal lengths of the primary mirror or lens and the eyepiece.

INSTRUCTIONS: Choose units and enter the following:

  • (Fp) This is the focal length of the primary lens or mirror.
  • (Fe) This is the focal length of the eyepiece.

Magnification: The calculator return the magnification of the telescope.

General Information

The magnification power M of a telescope is the ratio of the focal length of the primary lens or mirror FP divided by the focal length of the eyepiece Fe.


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