Newtonian-Cassegrain telescope

Newtonian-Cassegrain telescope

[nü′tō·nē·ən ′kas‚gran ′tel·ə‚skōp]
(optics)
A modification of a Cassegrain telescope in which the light reflected from the hyperboloidal secondary mirror is again reflected from a diagonal plane mirror and focused at a point on the side of the telescope, avoiding the need to pierce the primary mirror and making the eyepiece more accessible. Also known as Cassegrain-Newtonian telescope.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
This site has two dome observatories--the smaller one houses a 0.45-meter (18-inch) Newtonian reflector, while the other shelters a computer-controlled 0.5-meter Newtonian-Cassegrain telescope. (The latter instrument will be replaced in the future with a state-of-the-art 0.9-meter telescope.) Star parties for our members are held here every month; the site is open to the public every three months.
From the start I had a combination Newtonian-Cassegrain telescope in mind.