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.
Telescope focal length
Eyepiece focal length
Eyepiece apparent field
Here is an analysis of your telescope's performance using the parameters selected above:
Telescope aperture (d) and focal length (F)
Telescope eyepiece focal length (25mm & 10mm) and apparent field (52)
Last updated on: Friday 8th September 2017
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