This page links to the individual VLT instrument health check pages with
image quality information. This information helps to assess how good the delivered image
quality in the data is. Ideally it is limited by the seeing conditions during the time
of observation, or, for instruments with AO, by the performance of the AO.
Most of the IQ monitoring was done by processing science frames. With the
rescoping of the QC group processes, science processing was terminated on Sep. 30, 2011,
and so was the IQ trending. Still, the historical information could be useful.
For a more detailed description see the general Image
Quality page. For a discussion of differences between the seeing derived
from VLT instruments and the seeing measured by the DIMM monitor see Sarazin
et al., 2008, Messenger 132, p. 11.