NGC7023 Iris Nebula in RGB from Stinger 450 f/12.6 Classical Cassegrain and FLI ML4022 with Optec IR blocking RGB filters

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taken under a full moon on June 26 and July 2-4, 2010 from my ranch in the California Sierra under exceptional seeing conditions at times

click image to see screenshot of focusing result

  

Stinger 450 Classical Cassegrain (18" f/12.6)  

Lumicon Giant Easy Guider with Focal reducer for final: F= 3366mm, f/7.4

Finger Lakes Microline ML4022  imaging camera operated at -25C

Optec IR-Blocking RGB filters (50mm round)

Robofocus

Finger Lakes CFW7 Filter wheel

SBIG ST7E guide camera

112 exposures of 1 minute Blue

142 exposures of 1 minute Red

152 exposures of 1 minute Green

6 hours 46 minutes total exposure time

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