Nasmyth telescope

The Nasmyth telescope is one of James Nasmyth (1808-1890) developed reflecting telescope, the beam path is extended by two auxiliary mirror and deflected out of the telescope tube. It is a combination of Newton and Cassegrain telescope.

As with the Cassegrain telescope, the light falls initially on a parabolic concave mirror polished, the primary or main mirror. This reflects the light to a smaller convex secondary mirror, the secondary mirror. However, it reached the Nasmyth telescope no hole in the primary mirror, but it is deflected by a previously inclined to the central axis plane mirror (tertiary level ) in the declination axis and emerges as the Newtonian reflector side of ( Nasmythfokus ). Visually, it is identical to the Cassegrain focus, by the tertiary mirror, however, reversed.

In an azimuthal mount, the focal point is located at the altitude axis and is thus independent of the telescopic tilt when the tilt of the tertiary mirror is tracked with the zenith angle of observation (see Coude construction). Therefore, there will be built a solid platform for observer or severe analyzers.

A further possibility is to design the rotatable mirror Nasmyth. The picture can thus for example be switched between an eyepiece for visual observation and a camera for astrophotography, or between different devices.

  • Reflecting telescope
  • Spectroscopy
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