28. August 2015: RALPH
18:40 - 19:22 UT: change neutral density filters. channel 5 (1064) 3.0 -> 2.520:21 - 20:31 UT: change neutral density filters (1064 not affected)
18:40 - 19:22 UT: change neutral density filters. channel 5 (1064) 3.0 -> 2.520:21 - 20:31 UT: change neutral density filters (1064 not affected)