Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Formulas - Telescope Magnification
Telescope Magnification Calculator
Telescope Magnification Calculator
Two-mirror telescopes: Cassegrain, Gregorian and variants
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
what telescope should i look for?
Telescope Focal Length: Everything You Need To Know
What is the magnifying power of the Galilean telescope, and what were the details of its components? - Quora
Telescope Equations
Thiery Legault - How to adjust the focal length ?
Newtonian Reflecting Telescope Designer
Telescope Magnification Calculator - Calculator Academy
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
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. $\\dfrac{3}{5}$
Thiery Legault - How to adjust the focal length ?
How to Choose Eyepieces for Your Astronomy Telescope
Telescope Focal Length Explained: Why Does It Matter? | StarLust
Effective Focal Length Calculator - Landscape Photography | Real Estate Photography
Tele Vue Optics: The Majesty Factor
astronomical optics, part 2: telescope & eyepiece combined
