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🔭 Telescope Magnification Calculator
Calculate magnification, exit pupil, and optimal eyepiece selection
📐 Magnification Formulas
Magnification = Focal Length / Eyepiece Focal Length
Exit Pupil = Eyepiece Focal Length / Magnification
Exit Pupil = Aperture / Magnification
Magnification in ×, Focal lengths in mm, Exit pupil in mm
Magnification:
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Exit Pupil:
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Field of View:
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Brightness Factor:
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💡 Tips & Information
- Exit pupil 2-7mm: Optimal for most observing conditions
- Exit pupil >7mm: Best for dark skies and wide-field views
- Exit pupil <1mm: High magnification but dimmer images
- Maximum useful magnification: ~2× aperture in mm
- Consider atmospheric seeing conditions for high power