Aplanatic telescope

a telescope having an aplanatic eyepiece.

See also: Telescope

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
A high-school mathematics teacher by profession, ED TURCO also built the 4-inch f/4.2 aplanatic telescope and crutch tripod featured in this magazine in November 1979, page 473, and January 1996, page 31, respectively.