M51 Whirlpool Galaxy
Date: 21 May night, 2003
Telescope: Celestron 8” SCT with stabilized mirror, on Gemini G-41 mount
Guiding: ST-4 Autoguider with Celestron C80, 80mm F11 refractor piggybacked on C8.
Camera: MX916 with ICX423AL (undebugged, more noise in image)
Location: Tai Mei Tuk, Hong Kong
Software: Image acquisition by Astroart, dark substracted and final brightness adjustment by Astroart