NGC7293 Helix Nebula
Date: 7 July 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 IDAS LPS filter, behind a Meade 0.63 reducer
Location: Tai Mei Tuk, Hong Kong
Exposure: 14 x 5mins
Software: Image acquisition by Astroart, calibration and auto-alignment by AIP4win, sigma-combined by Sigma, R-L deconvolution by AIP4win, and final brightness adjustment by Astroart