M57 RGB from Stinger 450mm classical cassegrain and FLI ML4022 

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Taken on June 8 - 10, 2010 from my ranch in the California Gold Country


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


Finger Lakes CFW7 Filter wheel

SBIG ST7E guide camera

26 exposures of 5 minutes Blue

24 exposures of 5 minutes Red

14 exposures of 1 minutes Green (too windy to take longer exposures or more exposures)

4 hours 24 minutes total exposure time

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