Published online by Cambridge University Press: 12 April 2016
To exploit the full effectiveness of large ground based telescopes, the focal reducer technique can be applied very adequately. We review recent Hoher List observatory developments of observing techniques for direct imaging, field spectroscopy with multi-slit and masking methods for background supression and double-grism arrangements (heliometer principle)for absolute radial velocity determinations with a focal reducer field spectrograph.
Dedicated to Professor Dr.Ch.Fehrenbach on the occasion of his 70th birthday, 1984 April 29