The Wide-Field STELLA Imaging Photometer WiFSIP. (a) The large 24-hole filter wheel during manufacture in the AIP workshop. (b) The instrument during first tests mounted on the 0.8 m RoboTel Nasmyth focus. The box with the filter wheel is now located on the top with the CCD dewar in blue connected to a closed-cycle cryocooler (not shown). The middle box contains the CCD controller in a thermally insulated aluminium enclosure. The lower black box contains the remaining electronics. Note that the instrument is flanged to an image derotator and is turning to compensate for the field rotation due to the alt-az mount.
