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Important Announcement: CTIO 4-m Telescope f/8...(1Sep92)
Secondary Temporarily Out of Service Starting 1 June 1993
(from CTIO, NOAO Newsletter No. 31, 1 September 1992)

Barring unexpected developments, the f/8 secondary will be sent out for
repolishing toward the end of the spring 1993 scheduling semester
(June, July) and then for several months in the following semester.
This affects the last two months of the period for which proposals are
due this coming 30 September. The date for recommissioning this focus
will be several months into the following semester and will be
announced before the corresponding proposal deadline (31 March 1993,
for the period starting August 1993).

As is described in an accompanying article, the purpose is to correct
spherical aberration and other optical problems which are severely
affecting the telescope's image quality.

During the time that the f/8 secondary is out of service, we will not
be able to offer the R-C spectrograph, echelle spectrograph, Rutgers
Fabry-Perot, or f/8 direct imaging.  The available instruments on the
4-m will be: all IR instruments, Argus, prime focus direct imaging.

Jack Baldwin

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