Imaging

The main thing that was changed in relation to the new detector controller was the automatic twilight flat field ``easyflat'' script. Beyond the change due to the strongly improved readout time, also the count rate the is aimed for was changed to reflect the change in gain, and to take advantage of the increase in dynamical range this level was also increased. The corresponding documentation was updated.

As part of a review of the target acquisition script for spectroscopy (see below) the pixel scale of the CCD in imaging mode using the UBVRI filters was checked. It was found that for all filters and both directions the pixel scale is consistent with a single value of 0.190 arcsec/pixel.