Telescope
Magnification, exit pupil, field of view, resolution, limiting magnitude and the Newtonian diagonal.
What to find:
All sizes in millimetres. Limiting magnitude and resolution are estimates for a good sky.
The telescope calculator finds the magnification, exit pupil, field of view, resolution and limiting magnitude, and the size of the diagonal of a Newtonian.
M = F / f, α ≈ 138″ / D, m ≈ 2.1 + 5 lg D
Example. D = 150 mm, F = 750 mm, a 25 mm eyepiece: magnification 30×, resolution about 0.92″.
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