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Dia. 52mm Focal Length 243mm Objective Lens Ultra Low Dispersion Diy Telescope | eBay
Amazon.com : Telescopes for Adults Astronomy, 70mm Aperture and 700mm Focal Length Professional Refractor Telescope for Kids and Beginners with Phone Adapter, AZ Mount and Tripod to Viewing Planets and Stars :
Two-mirror telescopes: Cassegrain, Gregorian and variants
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Two-mirror telescopes: Cassegrain, Gregorian and variants
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