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Vixen (telescopes)
Vixen is a Japanese company that makes telescopes, binoculars, spotting scopes and accessories for their products.
Among many other more mainstream products they have created two unusual varieties of catadioptric telescopes with an open tube design instead of the full-aperture corrector plate of the Schmidt–Cassegrain and most Maksutov–Cassegrain designs.
==Klevtsov–Cassegrain==
This design is based on the Maksutov–Cassegrain. It provides correction of aberrations via a two-element meniscus-shaped corrector lens in front of the secondary mirror. This design was originally envisaged by G. I. Popov with a practical implementation by Yu. A. Klevtsov. It is produced with apertures of 8, 10.25 and 13 inches. The 8-inch model employs a refractor style rack and pinion focuser, while in the larger designs the primary mirror is moved as in most other small to medium-sized Cassegrain designs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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