 A 150mm aperture Maksutov-Cassegrain telescope. The Maksutov is a catadioptric (mirror-lens) telescope that is designed to minimize off-axis aberrations such as coma. Image File history File linksMetadata Download high-resolution version (844x900, 67 KB) A 150mm aperture Maksutov telescope. ...
Image File history File linksMetadata Download high-resolution version (844x900, 67 KB) A 150mm aperture Maksutov telescope. ...
a big (1) and a small (2) aperture For other uses, see Aperture (disambiguation). ...
Optical systems which involve both lenses and mirrors. ...
A telescope (from the Greek tele = far and skopein = to look or see; teleskopos = far-seeing) is an instrument designed for the observation of remote objects. ...
In telecommunication, an off-axis optical system is an optical system in which the optical axis of the aperture is not coincident with the mechanical center of the aperture. ...
Aberration (Latin ab, from or away + errare, to wander), a deviation or wandering, especially used in the figurative sense as: In ethics, a deviation from the truth. ...
In optics (especially telescopes), the coma in an optical system refers to monochromatic aberration inherent to certain optical designs or due to imperfection in the lens or other components which results in off-axis point sources such as stars appearing distorted. ...
Invention and Design
Invented by the Russian optician Dmitri Maksutov in 1944, the design uses a spherical primary mirror in conjunction with a "meniscus corrector shell" at the entrance pupil in order to correct spherical aberration, which is a significant problem in other types of reflecting telescopes. The chief disadvantage of the Maksutov design is that it does not scale up well to large apertures (>250mm/10 inches), since the corrector plate rapidly becomes prohibitively large, heavy and expensive as the aperture increases – most commercial manufacturers usually stop at 180mm (7 inches). Image:Dmitry Dmitriyevich Maksutov. ...
A primary mirror is a form of distributed data management on the Internet. ...
A lens. ...
Focal plane Longitudinal sections In optics, spherical aberration is an image imperfection that occurs due to the increased refraction of light rays that occurs when rays strike a lens or mirror near its edge, in comparison with those that strike nearer the center. ...
A reflecting telescope (reflector) is an optical telescope which uses a combination of curved and plane (flat) mirrors to reflect light and form an image (catoptric), rather than lenses to refract or bend light to form an image (dioptric). ...
An inch (plural: inches; symbol or abbreviation: in or, sometimes, ″ - a double prime) is the name of a unit of length in a number of different systems, including English units, Imperial units, and United States customary units. ...
Applications At the time of his invention, Maksutov himself hinted at the possibility of a 'folded' Cassegrain-type construction. John Gregory, a designer for Perkin-Elmer, developed a Maksutov-Cassegrain from Maksutov's ideas. Gregory later published his landmark design for two f/15 and f/23 Maksutov-Cassegrain telescopes in a 1957 issue of Sky and Telescope. Commercial use of the design was explicitly reserved for Perkin-Elmer. Light path in a Cassegrain reflector First developed in 1672 by Laurent Cassegrain, a Cassegrain Telescope this type of reflector is a combination of a prime concave and a secondary convex mirror, both aligned axially. ...
PerkinElmer, Inc. ...
 Light path in a Maksutov-Cassegrain Most Maksutovs manufactured today are this type of 'Cassegrain' design (sometimes called a Spot-Maksutov) that use, as secondary, a small aluminized spot on the inner face of the corrector. This has the advantage of fixing the alignment of the secondary and eliminates the need for a 'spider' that would cause diffraction spikes. The disadvantage is that a degree of freedom (the radius of curvature of the secondary) is lost, that radius being the same as that of the rear meniscus face. Gregory himself, in a second, faster (f/15) design resorted to aspherization of the front corrector surface (or the primary mirror) in order to reduce aberrations. Download high resolution version (814x244, 17 KB) Modified from http://de. ...
Download high resolution version (814x244, 17 KB) Modified from http://de. ...
Astronomical uses The focal ratio of the Maksutov-Cassegrain design provides high powers and a narrower field of view. This makes them unsuitable for wide-field Astrophotography but superb at lunar and planetary imaging. They are also very adept at imaging tightly packed formations such as globular clusters and at splitting double stars. Maksutov-Cassegrain telescopes have been sold on the amateur market since the 1950s. Most early models were small run prestige models that were very expensive. The mid-70s saw the introduction of mass-produced models by some of the major commercial manufacturers. More recently low-cost Russian and -lately- Chinese mass-production have pushed the prices down even farther. Today the design has become a popular choice for the amateur astronomer, if not a 'telescope for the masses', something unthinkable in the 60s when even a small Maksutov-Cassegrains such as the 'Questar 3.5' were quite expensive and within the reach of deep pockets only. A 35mm lens set to f/11, as indicated by the white dot above the f-stop scale on the aperture ring In photography the f-number (focal ratio) expresses the diameter of the diaphragm aperture in terms of the effective focal length of the lens. ...
Astrophotography is a specialised type of photography that entails making photographs of astronomical objects in the night sky such as planets, stars, and deep sky objects such as star clusters and galaxies. ...
Apparent magnitude: up to -12. ...
The eight planets and three dwarf planets of the Solar System. ...
A globular cluster is a spherical bundle of stars (star cluster) that orbits a galaxy as a satellite. ...
This page is about a novel by Robert Heinlein. ...
It has been suggested that this article or section be merged with Skygazing. ...
Questar Corporation is a company based in New Hope, Pennsylvania, which manufactures precision optical devices for consumer, industrial, aerospace, and military markets. ...
Industrial/Aerospace uses The Maksutov design has been used extensively in military, industrial, and Aerospace applications. Since all of the optical elements can be permanently fixed in alignment and the tube assembly can be environmentally sealed the design is extremely rugged. That makes them ideal for tracking, remote viewing, and radar calibration/boresighting where instruments are subjected to severe environments and high g-forces. Look up aerospace in Wiktionary, the free dictionary. ...
Imagine you are standing upright on the ground. ...
The nominal acceleration due to gravity at sea level on the Earths surface, also known as standard gravity, is defined as exactly 9. ...
Derivative Designs
The Klevtsov-Cassegrain A variation on the Maksutov is the Klevtsov-Cassegrain. It has an open tube and provides correction by moving the Maksutov style meniscus corrector lens to in front of the secondary. This design was originally envisaged by G. I. Popov with a practical implementation by Yu. A. Klevtsov.
See also (commercialy produced models) |
Feeds |
Contact