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 M51 - Whirlpool Galaxy 

CloseUp on Galaxy

Inverted Luminance

Optics: GSO RC 10" F8 2000mm - Astrograph Ritchie-Chrétien
Mount: AP Mach1 GTO on Gemini Q-Lock tripod
Camera: ATIK 4000LE with SX USB Filter Wheel
Filters: Baader LRGB 2"
Guiding Systems: SXV-AO-LF Active Optics - SX Lodestar
Dates/Times: 7 Aprile 2011
Location: Pragelato (Torino) - Alps - Italy
Exposure Details: L:R:G:B => 240:50:40:50 = > (24x10):(5x10):(4x10):(5x10) All Bin1 [num x minutes]
Cooling Details: -20 °C
Acquisition: Maxim DL/CCD, Perseus
Processing: CCDStack2, PS CS2, GradientXTerminator
Mean FWHM: 2.40 / 3.22 "
SQM-L: 21.24
NOTE: Some frames have FWHM value affected from wind