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A Cheshire eyepiece or Cheshire collimator is a simple tool that helps aligning the optical axes of the mirrors or lenses of a telescope, a process called collimation. It consists of a peephole to be inserted into the focuser in place of the eyepiece. Through a lateral opening, ambient light falls on the brightly painted oblique back of the ...
Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.
Most amateur reflector telescopes need to be re-collimated every few years to maintain optimum performance. This can be done by simple visual methods such as looking down the optical assembly with no eyepiece to make sure the components are lined up, by using a Cheshire eyepiece, or with the assistance of a simple laser collimator or ...
The main instrument at Sherwood Observatory is a Newtonian telescope on an equatorial fork mount. The telescope was initially constructed as a Nasmyth reflector, but due to collimation problems it was converted in the 1990s to the simpler Newtonian configuration. The telescope has stepper motor drive control with an electrical focusser.
These conditions together explain why the bright spot is not encountered in everyday life. However, with the laser sources available today, it is undemanding to perform an Arago-spot experiment. [8] In astronomy, the Arago spot can also be observed in the strongly defocussed image of a star in a Newtonian telescope.
A refracting telescope commonly used is the Galilean telescope which can function as a simple beam expander for collimated light. The main advantage of the Galilean design is that it never focuses a collimated beam to a point, so effects associated with high power density such as dielectric breakdown are more avoidable than with focusing ...
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"As seen on TV" is a generic phrase for products advertised on television in the United States for direct-response mail-order through a toll-free telephone number. As Seen on TV advertisements, known as infomercials , are usually 30-minute shows or two-minute spots during commercial breaks.
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