Computer Science
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001msngr.103....4g&link_type=abstract
The Messenger, No. 103, p. 4 - 7 (March 2001)
Computer Science
Telescopes, Image Quality
Scientific paper
On the very first period of operation of the 2.2-m telescope, a direct CCD camera was offered to the community. With a pixel size of 0.35 arcsec and a small field of 3 arcmin, the telescope image quality was never reported as being bad or showing asymmetric, elliptical images. In the mid-1990s, a new imaging instrument called EFOSC2 was installed at the telescope. Observers soon began seeing variable image elongations across the full field, which were later identified as coming from the instrument and not the telescope. Meanwhile, the optical quality of the telescope was measured to be as good as 0.35 arcsec d80% close to zenith, using our portable Shack- Hartmann called Antares. The optical quality of the EFOSC instrument was strongly dependent on the precision with which focus had been achieved, and subsequent variations with temperature. The EFOSC camera focus did not include temperature compensation as was the case with EFOSC1 on the 3.6-m. The focus degradation introduced field curvature and increasing astigmatism as one moved off-axis. Optical quality tests with EFOSC after refocusing the camera and performing a careful thorough focus sequence reestablished the instrument and telescope quality within the resolution delivered by the two pixels sampling 0.7 arcsec.
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