A novel zoom-lens spectrograph for a small astronomical telescope

Details A novel zoom-lens spectrograph for a small astronomical telescope A novel zoom-lens spectrograph for a small astronomical telescope

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..158e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 1, pp. 158-162.

Astronomy and Astrophysics

Astronomy

3

Instrumentation: Spectrographs

Scientific paper

A novel astronomical spectrograph has been constructed using a zoom lens as the focusing element. The linear dispersion is continuously variable from 33 to 1272A mm^-1 by the use of a grating turret with three gratings and a zoom lens with a focal length range of 50-250 mm. The absorption losses and chromatic aberration are shown to be acceptable. The instrument has been used successfully on a 0.4-m Cassegrain telescope with a cooled CCD detector for a number of student projects, including the determination of the redshift of the brightest quasar, 3C273.

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