Astrophysics (Index)About

Schmidt-Newton telescope

(SNT, Schmidt-Newtonian telescope)
(type of reflector telescope)

A Schmidt-Newton telescope (sometimes abbreviated SNT) is a variation on a Newtonian telescope in which the light first passes through a particular kind of lens (Schmidt corrector plate) followed by a spherical primary mirror, then a flat, angled secondary mirror (fold mirror). As such, it is also a variation on a Schmidt camera. The corrector plate reduces spherical aberration, giving it less coma than a reflector telescope that incorporates a parabolic mirror, making shorter focal lengths useful. The presence of a lens with the size of the aperture and primary mirror adds a challenge to making large (research) telescopes with the design. Current amateur telescopes include models with this design.


(telescope type,reflector)
Further reading:
https://en.wikipedia.org/wiki/Schmidt-Newton_telescope
https://www.telescope-optics.net/SN.htm

Referenced by pages:
Newtonian telescope
reflector telescope
Schmidt camera
telescope type

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