Dobsonian

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Dobsonian

(dob-soh -nee-ăn) A telescope with a simple but highly stable altazimuth mounting that can be constructed and used by an amateur astronomer. It swings very smoothly between side bearings and is mounted on a simple sturdy rotating platform. The mounting, pioneered in the mid-20th century by John Dobson, a US telescope maker, is popular for large-aperture short-focus reflectors.