Prime focus

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

Prime Focus
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.

Prime Focus
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.

Prime focus, barlow or variable projection.
Prime focus 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.

Prime Focus
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.

prime focus - (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.

ULYSSES PRIME FOCUS HGA
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.

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 ...

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 prime focus will obstruct the light on its way towards the primary mirror, we can not put large instruments there.

The telescope is unusual in that the mirror is not a symmetrical dish, but is a section of a much larger parabolic figure with the receiver where the prime focus of the entire mirror would be.

Another view of the DSS-43 antenna showing the sub-reflector near prime focus 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.

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: prime focus, Newtonian, Cassegrain, Coudé, and Schmidt camera. The Ritchey-Chrétien design is also used.

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 prime focus the focal length ...

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.

See also: Focus, Telescope, Light, Second, Primary