Gregorian telescope


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Synonyms for Gregorian telescope

a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror

References in periodicals archive ?
Considering that Messier saw the Dumbbell's overall oval shape in his 6-inch Gregorian telescope from a rooftop in smoky 1764 Paris, one night before a full Moon no less, your chances of seeing the entire oval are quite good.
Perhaps the only form that seems to have been overlooked is the use of field correctors at the intermediate focus of a modified Gregorian telescope.