下弦月的直壁

C.L.Chan

下弦月的直壁 , 由上弦月的一道黑線變成一道光線 , 可惜大氣條件差 , 未得清晰影象 .
Straight Wall, 2018/04/08 HKT 03h05m, Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Prime Focus, Losmandy G-11 Equatorial Mount with motor drive. Camera ZWO ASI 120MC CMOS Web Cam, Shoot at 20 frames/sec, stack and optimize 25 in 616 frames with Software RegiStax V5, Low quality set at 80%, Microsoft photo adjust brightness & color. Atmospheric codition : Transparent : 7/10, Seeing : 7/10. Equipment borrowed from Mr. Ng. Taken at Kennedy Town堅尼地城, Hong Kong.