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Cassegrain Nasmyth

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This telescope was built for visual work , but is also used with different CCD detectors. Optical design 0.61m f/15 Cassegrain Nasmyth... Observatory code 238. Oslo Norway

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: ex. the W. M. Keck Observatory.

Figure 1 shows the light-path from a star based on the 0.61m telescope in Oslo. Figures 2 and 3 show the use of a focal reducer, flip mirror unit, ocular and CCD Camera. See also: Nasmyth telescope.

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