Schmidt–Newtonian telescope
 | This article needs additional citations for verification. (January 2008) |
A Schmidt–Newtonian telescope or Schmidt–Newton telescope is a
Schmidt corrector plate, which corrects the spherical aberration and holds the secondary mirror. The resulting system has less coma and diffraction effects than a Newtonian telescope with a parabolic mirror (which is free of spherical aberration but not free of coma) and a "spider" secondary mirror support.[1]
The design uses a 45° flat secondary mirror to view the image, as in a standard Newtonian telescope.
Advantages
Schmidt–Newtonian telescopes offer images with less
focal ratios. Telescopes using this design typically have a short focal ratio of around f/4, making them well suited for astrophotography or CCD imaging. Schmidt–Newtonians also typically cost less than the more commonly produced Schmidt–Cassegrain telescopes since they don't have the added curved secondary mirror or the complicated primary mirror focusing mechanism found in most Schmidt–Cassegrain designs.[1]
See also
References
- ^ a b "Schmidt-Newton telescope". telescopeOptics.net. Retrieved 28 August 2012.
External links
Wikimedia Commons has media related to Schmidt-Newton telescopes.