How does a Ritchey Chretien telescope work?
RC telescopes use hyperbolic mirrors to eliminate optical errors like coma and chromatic aberrations off-axis while producing the flattest focal plane possible without lenses.
What is unique about a Cassegrain telescope?
The Cassegrain telescope has a curved focal surface which is located behind the primary mirror. Due to the onset of coma and astigmatism, the telescope has a modest useful field-of-view.
What is meant by Cassegrain telescope?
Definition of Cassegrain telescope : a reflecting telescope that has a paraboloidal primary mirror and hyperboloidal secondary mirror, is equivalent in its optical effects to a telephoto lens, and usually has the light brought to a focus through a perforation in the center of the primary mirror.
What type of telescope is a Ritchey Chretien?
A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors (coma).
Who makes Ritchey Chretien telescopes?
OGS manufactures Ritchey-Chretien telescopes, Classical Cassegrain, custom optical systems and research grade tracking mounts. Our telescopes range in size from 10-80 inches.
Who invented the catadioptric telescope?
Léon Foucault developed a catadioptric microscope in 1859 to counteract aberrations of using a lens to image objects at high power. In 1876 a French engineer, A. Mangin, invented what has come to be called the Mangin mirror, a concave glass reflector with the silver surface on the rear side of the glass.
What type of telescope is a Cassegrain telescope?
“Classic” Cassegrain telescopes The “classic” Cassegrain has a parabolic primary mirror and a hyperbolic secondary mirror that reflects the light back down through a hole in the primary. Folding the optics makes this a compact design.
Why do Catadioptric telescopes use both concave and convex mirrors?
Why do catadioptric telescopes use both concave and convex mirrors? Some catadioptric telescope designs use both concave and convex mirrors to reduce the spherical aberrations caused by marginal rays.
Who invented Cassegrain telescope?
Laurent Cassegrain, a French instrument maker, died Aug. 31, 1693, at the age of about 64. Cassegrain, whose name is well known to amateur telescope makers, is the most shadowy of historical figures; we didn’t even learn his first name until 1997. In 1672, Cassegrain invented a new kind of reflecting telescope.
How does the catadioptric telescope work?
Catadioptric telescopes are optical telescopes that combine specifically shaped mirrors and lenses to form an image. This is usually done so that the telescope can have an overall greater degree of error correction than their all-lens or all-mirror counterparts, with a consequently wider aberration-free field of view.