NGC 7331 with Calar Alto 3.5-meter Telescope
Image by Vicent Peris(OAUV/CAHA/PTeam)

LAICA camera at the prime focus of the 3.5 m Zeiss telescope of Calar Alto Observatory (f/3.9). Data acquired with one of the four CCD detectors of LAICA, covering an apparent field of view of 15×15 arcminutes. 139 minutes total integration time with 1- and 10-minutes individual exposures through Johnson B2 and V, and Sloan r' filters.