Focus Friday - The Largest Optical Refracting Telescopes

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Focus Friday - The Largest Optical Refracting Telescopes

Friday, Mar 18 2011 by kjfitz
A refracting or refractor telescope is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used for long focus camera lenses.