Astronomy Pages | Eyepiece Calculator | Western Washington University
Astronomy Boy: Eyepiece Focal Length Calculators
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OAC: Obs Aids
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Microscope Magnification Calculator • Microscopy • Convertori online
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Astronomy Tools
Telescope Calculator: How Does Your Telescope Perform? | Sky & Telescope - Sky & Telescope
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Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
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Android Apps by א.מ. on Google Play
