Telescope Calculator
From a telescope's aperture and focal length and an eyepiece focal length, computes magnification, focal ratio, exit pupil, resolving power and limiting magnitude.
Read the full guide to this tool
Results
Notes
- Magnification is the telescope focal length divided by the eyepiece focal length; a shorter eyepiece magnifies more.
- Aperture, not magnification, sets how much detail and how faint a star you can see; useful magnification tops out near 2× the aperture in mm.
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