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Keplerian telescope

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Keplerian telescope [ke′plir·ē·ən ′tel·ə‚skōp]
(optics)
A telescope that forms a real intermediate image in the focal plane and can be used for introducing a reticle or a scale into the focal plane.
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1655 Dutch scientist Christiaan Huygens discovers Saturn's rings and its moon Titan using a Keplerian telescope with an 11-foot focal length.
Seeing better: in 400 years, telescopes advance from rooftops to ... by Science News
The telescope come in a variety of versions; the Galilean telescope which is named after its creator was one of the first versions and was improved upon by Johannes Kepler with the Keplerian Telescope, which is a refractor telescope that utilized a convex eyepiece as opposed to a concave of the Galilean model.
The World of Refractor Telescopes by Ann Marier / Computers and Internet community
 
 
 
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