Keplerian telescope(kep-leer -ee-ăn) The first major improvement of the Galilean telescope, developed by the German astronomer and mathematician Johannes Kepler, in which a positive (convex) lens was used as the eyepiece in place of the negative (concave) lens that Galileo used (see illustration). This gave a larger though inverted field of view and much higher magnifications.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Keplerian telescope[ke′plir·ē·ən ′tel·ə‚skōp]
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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.