Assertion: newtonian telescope's design | /r/Synonym | a gregory–maksutov
Facets:
Source sentences:
text: Most Maksutovs manufactured today are this type of 'Cassegrain' design (called either a "Gregory–Maksutov" or "Spot-Maksutov") that use all-spherical surfaces and have, as secondary, a small aluminized spot on the inner face of the corrector.