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Proceedings Paper

An Autocollimating F/1 CAMERA For Use With Echelle Spectrographs Using Image Converters
Author(s): Aden B. Meinel
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Paper Abstract

Two spectrograph configurations are considered for fast echelle spectrographs, one autocollimated and another with the camera placed at 45° to the collimator beam. An example is given where both cameras have the same focal length and gratings the same angular dispersion. The effect of different slit widths and astronomical seeing are considered. The effect of optical aberrations for the two cameras, an f/1.0 system for the 45° camera angle and 0.77 for the autocollimated configuration offsets the slit width advantage of the 45° camera angle case. The light losses due to the use of a slit re-imaging lens and double-pass through the camera are considered for the autocollimated configuration. The f/1.77 camera permits easy folding for use with an image tube, and if made of a solid block of optical material yields close to an f/1 camera with the same geometrical dimensions. All things considered, we recommend the autocollimated configuration for optimum use with echelle spectrographs.

Paper Details

Date Published: 3 May 1979
PDF: 7 pages
Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); doi: 10.1117/12.957114
Show Author Affiliations
Aden B. Meinel, University of Arizona (United States)

Published in SPIE Proceedings Vol. 0172:
Instrumentation in Astronomy III
David L. Crawford, Editor(s)

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