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The Klevtsov–Cassegrain telescope is a type of
In the Klevtsov-Cassegrain, all of the optical surfaces are spherical or near-spherical. The secondary Mangin mirror () and the - Vladimir Sacek, telescope-optics.net, Notes on AMATEUR TELESCOPE OPTICS, CATADIOPTRIC TELESCOPES, 10.2.1
/ref> This design was originally envisaged by G. I. Popov with a practical implementation by Yuri A. Klevtsov. Commercial manufacturers of the design include Novosibirsk TAL and
Review of a Klevtsov-Cassegrain telescope
Telescope types {{observatory-stub
The Klevtsov–Cassegrain telescope is a type of catadioptric
A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors ( catoptrics). Catadioptric combinations are used in focusing systems such as searchlights, ...
Cassegrain telescope that uses a spherical
A sphere () is a geometrical object that is a three-dimensional analogue to a two-dimensional circle. A sphere is the set of points that are all at the same distance from a given point in three-dimensional space.. That given point is the ce ...
primary mirror
A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope.
Description
The primary mirror of a reflecting telescope is a spherical or parabolic shaped disks of polished reflective meta ...
and a sub-aperture secondary corrector group composed of a small lens and a Mangin mirror
In optics, a Mangin mirror is a negative meniscus lens with the reflective surface on the rear side of the glass forming a curved mirror that reflects light without spherical aberration if certain conditions are met. This reflector was invented i ...
.
Design
In the Klevtsov-Cassegrain, all of the optical surfaces are spherical or near-spherical. The secondary Mangin mirror () and the meniscus corrector
A meniscus corrector is a negative meniscus lens that is used to correct spherical aberration in image-forming optical systems such as catadioptric telescopes. It works by having the equal but opposite spherical aberration of the objective it is d ...
(''C'') are held in place by a spider vane and the front of the telescope tube is otherwise open.
These types of telescopes have the disadvantage of the spider, which holds the corrector, causing diffraction artifacts and, since multiple surfaces are involved, achieving good aberration correction can be very complex./ref> This design was originally envisaged by G. I. Popov with a practical implementation by Yuri A. Klevtsov. Commercial manufacturers of the design include Novosibirsk TAL and
Vixen
Foxes are small to medium-sized, omnivorous mammals belonging to several genera of the family Canidae. They have a flattened skull, upright, triangular ears, a pointed, slightly upturned snout, and a long bushy tail (or ''brush'').
Twelve sp ...
.
See also
* Argunov–Cassegrain telescope * Cassegrain reflector *List of telescope types
The following are lists of devices categorized as types of telescopes or devices associated with telescopes. They are broken into major classifications with many variations due to professional, amateur, and commercial sub-types. Telescopes can be ...
References
External links
Review of a Klevtsov-Cassegrain telescope
Telescope types {{observatory-stub