Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
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Left: The telescope was a fast (f/1) Gregorian system. The primary... | Download Scientific Diagram
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How does one determine magnification? I have an Edmund Scientific Astroscan, 4-1/8-inch aperture, F/4.2 reflecting telescope, used with a 2.5x Barlow lens and a 28mm Plossl eyepiece. | Astronomy.com
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Telescopes and Microscopes
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