|
The optical design of the Schmidt-Newton telescope combines elements from both the Schmidt camera and the Newtonian telescope. In this system the parabolic primary mirror common in newtonian reflector is replaced by a spherical mirror, which introduces spherical aberration. This is corrected by the Schmidt corrector plate, like that used in Schmidt-Cassegrain telescopes. From the Newtonian, it inherits the elliptic secondary mirror.
Advantages Spherical mirrors are much easier to make especially in short focal ratios. Telescopes using this design should have a short focal ratio of around f/4 making them well suited for astrophotography or CCD imaging. However, this advantage is not relevant for visual use. Schmidt-Newtonian telescopes suffers from less coma than a Newtonian of the same focal ratio, although it still has some. | ||||||||
|
| |||||||||
 |
|
| |