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Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
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How does one calculate the total angular magnification of a telescope given only the focal length? - Quora
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Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
