Astronomical Telescope Magnification, True FOV & Exit Pupil Calculator
Calculate telescope visual magnification (M), True Field of View (TFOV in degrees & arcmin), optical focal ratio (f-number), and exit pupil diameter for observing planets and deep-sky objects.
Calculator Inputs
Live Real-TimeOptical Magnification Power
True Field of View (TFOV Degrees)
0.43 deg
True Field of View (Arcminutes)
25.8 arcmin
Exit Pupil Diameter (mm)
1.67 mm
Focal Ratio (f/number)
6 f/
Crisp Diffraction-Limited View: Magnification is well within the aperture's 2x useful resolving limit.
Telescope Optical Performance
Detailed Calculation Breakdown
Calculation Methodology
Magnification: M = F_scope / F_eyepiece. True FOV: TFOV = AFOV / M. Focal Ratio = F_scope / Aperture (D). Exit Pupil (mm) = Aperture / M.
Important Legal & Educational Disclaimer
This astronomical optics tool calculates telescope visual and eyepiece parameters.
This calculator is designed for educational and informational purposes only based on public statutory frameworks. The outputs do not constitute binding financial, tax, or legal advice. We assume no liability for decisions made based on these estimations. Always verify with the relevant official authorities or a certified professional advisor.
Frequently Asked Questions
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