Target: NGC436 Date: 2012-08-22 Time: 06:39 Telescope: CDK20N Camera: Apogeen U16M Filters: g06:39riz Exposure time: 100s per filter Observer: John Kielkopf Processing: John Kielkopf Color map i->R, r->G, g->B square root stretch Lunar scattered light Light dewing of secondary makes a halo on some stars Incomplete compensation of bad CCD column