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Prime focus

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prime focus The point in a reflecting telescope where the mirror focuses incoming light to a point.

The point at which an object mirror forms an image in a reflecting telescope
Primeval Atmosphere ...

Prime Focus - Prime focus describes a camera attached to a telescope without any other eyepieces or camera lenses in the optical path. The telescope then acts as the camera lens.

The focal point of the large primary reflecting mirror in astronomical telescopes when the light source is extremely distant.

Prime focus
In a prime focus design in large observatory telescopes, the observer sits inside the telescope, at the focal point of the reflected light. In the past this would be the astronomer himself, but nowadays CCD cameras are used.

, barlow or variable projection.
can work with most scopes
A barlow or Variable projection may NOT work depending on the scope's focuser travel.
Control image brightness and contrast by: ...

Prime Focus Photography - An astrographic technique in which a 35mm camera is positioned at a telescope's prime focus - the focal plane of the primary mirror or objective lens. No eyepiece is used.

The location where light reflected from the primary mirror of a reflecting telescope comes into focus.

prime focus - The point in a telescope where the objective focuses the light.
prism - A wedge-shaped piece of glass that is used to disperse white into a spectrum.

- (n.)
The location at which the main lens or mirror of a telescope focuses an image without being reflected or refocused by another mirror or other optical element.

The prime focus of the reflector is inside the main tube of the telescope and thus the image cannot be observed there without blocking part of the incoming light. A variety of schemes are employed to divert the image to a more convenient location.

Dish-shaped HGAs are the spacecraft antennas principally used for long-range communications with Earth.

Photography, Prime Focus
An astrographic technique in which a 35mm camera is positioned at a telescope's prime focus — the focal plane of the primary mirror or objective lens. No eyepiece is used.

primeval fireball high-powered explosion from a superhot, superdense state of condensed matter (the big band) that supposedly initiated the expansion of the Universe.

In a bid to answer the burning question of how galactic formation patterns become established and evolve, the research team led by Dr Yusei Koyama used the Subaru Prime Focus Camera to make a panoramic observation of the rich galaxy cluster ...

Radio telescopes are mainly either or Cassegrain reflectors. However, the radio telescope looks very different from the optical telescope; radio telescopes are much larger than optical telescopes.

The primary mirror reflects the light of the celestial object to the prime focus near the upper end of the tube.

As any instrument at the will obstruct the light on its way towards the primary mirror, we can not put large instruments there.

This is the inner half of a V-band CCD image taken in twilight (15 seconds' exposure) at the prime focus of the 4-meter Mayall telescope of Kitt Peak National Observatory.

Another view of the DSS-43 antenna showing the sub-reflector near above the dish and the multiple primary feed system at the center of the dish.

The Lovell 76 metre telescope is a parabolic prime focus dish named after the founding director of the Jodrell Bank Observatory, Sir Bernard Lovell. The observatory is owned and operated by the University of Manchester.

Until recently, astronomers actually sat in a cage at the of the big mirror at the top of the telescope and stayed there all night to take images and spectra.

A class of reflecting telescope which uses a concave secondary mirror placed after the prime focus is reached instead of a convex secondary placed before the prime focus. [McL97]
Gregorian Calendar ...

Reflecting telescopes (called "reflectors") come in five main configurations: , Newtonian, Cassegrain, Coudé, and Schmidt camera. The Ritchey-Chrétien design is also used.

MegaCam sits at the prime focus of the CFHT, the Canada-France hawaii telescope, a 3.6 m optical telescope in Hawaii.
Cost: Professional-grade CCD chips are expensive.

The width of field (W) is found with: W = (57.3 x S) / F in degrees or 206265 S/F in seconds of arc, where S = film size and F = focal length of the telescope or camera lens. For example, using a 6' f/4 Newtonian at the focal length ...

See also: See also: Telescope, Astro, Star, Astronomy, Sky

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