下弦月過後的直壁

C.L.Chan

下弦月過後的直壁 , 過了這天, 這道光線 , 就會隱藏在日落的黑暗之中 , 長達15天 .
Straight Wall, 2018/04/09 HKT 05h18m, 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 Gamma=50, Gain=50, Expo=32ms , 20 frames/sec, stack and optimize 22 in 411 frames with Software RegiStax V5, Low quality set at 95%, get 97% improvement. Microsoft photo adjust brightness & color. Atmospheric condition : Transparent : 7/10, Seeing : 7/10. Equipment borrowed from Mr. Ng. Taken at Kennedy Town堅尼地城, Hong Kong.