NGC7000 North American Nebula
Telescope: Old T-mount 200mm F4.5 lens stopped down to F5.6, on Gemini G-41 mount
Guiding: ST-4 Autoguider with Celestron C8
Filtration: Astronomik 13nm Hydrogen Alpha filter
Exposure: 9 x 20mins
Software: Image acquisition by MaximDL 3.0, calibration and auto-alignment by Astroart 3.0, sigma-combined by Sigma, final brightness adjustment by Astroart.