NGC4490 and NGC4485 unfiltered from Stinger 450mm Classical Cassegrain and FLI ML4022 camera

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Taken on May 15, 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

Robofocus

Finger Lakes CFW7 Filter wheel

SBIG ST7E guide camera

Ten exposures of 5 minutes: no filter used

50 minutes total exposure time