Imaging

To see the behavior of the illumination pattern tests observations were made with a narrow-band filter of a pure emission line source (a bright Herbig-Haro object) that was scanned across the field-of-view. Aperture photometry on the target after flat-fielding and sky-subtraction show strong declines in the flux of around 20% in the far corners (which at least partly can be due to the known optical distortion which was not corrected for), but over the main of the field-of-view (i.e., up to at least 100 pixels from the edge) there is no measurable flux loss.

The new `quality control' lamp for dome-flats, darks etc. remotely controllable from the control room, has been calibrated and all documentation is updated.