Telescope aperture | Telescope focal length | Eyepiece focal length | Eyepiece apparent field |
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Here is an analysis of your telescope's performance using the parameters selected above: |
Telescope Calculator
What's the optimum magnification for my instrument? Is the field of view of a given eyepiece too small to see all of the Moon? Is there a minimum magnification for my scope? What sort of limiting magnitude should I expect with an instrument of a given aperture? You can find answers to all these questions and many more besides with this interactive telescope calculator.