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Cassegrain telescope

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Cassegrain telescope [kas·gran ′tel·ə′skōp]
(optics)
A reflecting telescope in which a small hyperboloidal mirror reflects the convergent beam from the paraboloidal primary mirror through a hole in the primary mirror to an eyepiece in back of the primary mirror.
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The third type is the Cassegrain telescope that is a mix of both mirror and lenses.
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I think somebody just ran the same e-mail through," says Lillig, who makes guitars for a living when he's not peering into the heavens with his 16-inch Cassegrain telescope that costs in the vicinity of $70,000.
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