: a telescope whose principal focusing element is a lens
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There are two basic types of telescope: refractors and reflectors.—Keith Cooper, Space.com, 20 Mar. 2025 When the sun set the comet was an easy object in a 50mm f/3.5 refractor and ASI178MC camera.—Joe Rao, Space.com, 27 Jan. 2025 These prominent features are best seen using a refractor telescope with a long focal length (the distance from the objective lens to the focal point) that accommodates eyepieces offering 200x magnification.—Jamie Carter, Space.com, 25 Dec. 2024 Another in 2007 used an off-the-shelf digital detector on a small refractor telescope to deliver remarkably decent photometric measurements, even for third-magnitude stars (which are somewhat fainter than those making up the Big Dipper).—Phil Plait, Scientific American, 26 July 2024 See All Example Sentences for refractor
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