Klevtsov–Cassegrain telescope

A Klevtsov-Cassegrain reflecting telescope

The Klevtsov–Cassegrain telescope is a type of catadioptric Cassegrain telescope that uses a spherical primary mirror and a sub-aperture secondary corrector group composed of a small lens and a Mangin mirror.

Design

Light path in a Klevtsov-Cassegrain reflector telescope

In the Klevtsov-Cassegrain all of the optical surfaces are spherical or near-spherical.^[1][2] The secondary Mangin mirror (M 2 ) and the meniscus corrector (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 spider to hold the corrector causing diffraction artifacts^[3] and, since multiple surfaces are involved, achieving good aberration correction can be very complex.^[4]

This design was originally envisaged by G. I. Popov with a practical implementation by Yuri A. Klevtsov. Commercial manufactures of the design include Novosibirsk TAL and Vixen.

See also

• Argunov–Cassegrain telescope
• Cassegrain reflector
• List of telescope types

References

1. New optical systems for small-size telescopes (abstract)
2. New optical systems for small-size telescopes
3. Diffraction effects of telescope secondary mirror spiders on various image-quality criteria
4. - Vladimir Sacek, telescope-optics.net, Notes on AMATEUR TELESCOPE OPTICS, CATADIOPTRIC TELESCOPES, 10.2.1

External links

• Review of a Klevtsov-Cassegrain telescope