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What determines a telescope's fstop? I often see the same size lens with different fstops. - Quora
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Telescope Focal Length: Everything You Need To Know
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A Galilean telescope measures 9 cm from the objective to the eye-piece. The focal length of the objective is 15 cm. Its magnifying power is A. $2.5$ B. $\\dfrac{2}{5}$ C. $\\dfrac{5}{3}$ D. $\\dfrac{3}{5}$
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Telescope stats explained | BBC Sky at Night Magazine
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
what telescope should i look for?
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Angular magnification of telescope if focal length of objective and eye lenses are - YouTube
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