Newtonian-Cassegrain telescope
McGraw-Hill Science & Technology Dictionary:
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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.
Wiley Book of Astronomy:
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Newtonian-Cassegrain telescope
A Cassegrain telescope fitted with a flat diagonal mirror to intercept the converging beam from the secondary and reflect it to the side of the tube. Unlike a standard Cassegrain, the primary mirror does not need a central hole, and the focal position can be arranged to coincide with the declination axis of the mounting to give a stationary observing position.
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