Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979msngr..16...26z&link_type=abstract
The Messenger, vol. 16, p. 26-30
Astronomy and Astrophysics
Astronomy
1
Auxiliary Instrumentation, Astronomical Accessories, Spectrometers, Photometers
Scientific paper
The primary mirror of the 3.6 m teleseope has a complicated figure, and a "corrector" must be inserted, just below the prime-focus cage, in order to obtain sharp images in this focus. Until now, a one-element (Gaseoigne) corrector has provided a usable field of about 16 arcmin or 6 cm. However, the full advantage of the excellent optical quality of the primary mirror ean only be realized with more complieated optical means. After a long period of testing, a three-element (triplet) corrector that is optimized for the blue spectral region and a similar one for the red region will now be installed. They are supported by the "triplet adaptor", an advanced optical-electronical-mechanical system that will be remotely controlled from the main observing console in the telescopc eontrol room. ESO engineer Manfred Ziebell is now trimming the rather complicated instrument to perfection and we may expect soon to see the first wide-field (1~2) photographs from the 3.6 m prime focus.
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