Tycho & Clavius

C.L.Chan

弟谷隕坑(左下央小山者), 與克拉維(左上具5個由小至大弧形排列隕坑者),  Tycho& Clavius, UT 2020 1125, 13h21m, Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm,Losmandy G-11 Equatorial Mount with motor drive. Camera QHY 5III 224 Color Cam,Capture with FireCapture, Shoot at Gamma=100, Gain=31, Expo= 0.23ms/frame, aviformat, stack and process 25% best frames in 1803 frames by free SoftwareAutoStakkert 3, wavelet with RegiStax V.6, Final touch by Microsoft Photosoftware. Atmospheric condition: Transparent: 8/10, Seeing : 7/10. Equipmentborrowed from Mr. Ng. The photo was taken at Kennedy Town 堅尼地城, Hong Kong.