Exact optics - V. Null tests for the mirrors of Schwarzschild's spectrograph camera

Astronomy and Astrophysics – Astronomy

Scientific paper

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Instrumentation: Spectrographs, Techniques: Spectroscopic, Telescopes

Scientific paper

Null tests are described for the strongly curved and highly aspheric mirrors of a set of `exact optics' spectrograph cameras based on the design of Schwarzschild. For f/1.0 and f/1.333 cameras having a focal length of 100mm the tests of each mirror are well within the Rayleigh limit and would permit construction on a larger scale. The ray-theoretical image diameters at the edge of the field of view of these two cameras are under 10μm unless they are scaled up to an aperture greater than 450mm.

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