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Cassegrain Nasmyth : ウィキペディア英語版 | Cassegrain Nasmyth
The Cassegrain Nasmyth telescope has the same optical design as the classical Cassegrain telescope except for a small tertiar mirror which send the light out on the side of the telescope tube instead of through a hole in the primary mirror. This design is common in large telescopes, for example W. M. Keck Observatory Example : Fig 1 show the lightpath from a star based on the 0.61m telescope in Oslo. Fig 2 and Fig 3 show the use of a focal reducer, flip mirror unit, ocular and CCD Camera... See also Nasmyth telescope. File:Cassegrain Nasmyth optical design.tif
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