NGC3718 Spiral Galaxy unfiltered from Stinger 450 Classical Cassegrain and FLI PL3200

Click image to enlarge, click here for highest resolution

Taken on March 16, 2008 from my backyard in Castro Valley, Ca.

 

Stinger 450 Classical Cassegrain (18" f/12.6)  

Lumicon Giant Easy Guider with Focal reducer for final: F= 3366mm, f/7.1

(binned 2x2, image scale = 0.84 arc-sec/pixel at capture)

Finger Lakes PL3200ME imaging camera operated at -45C 

Robofocus

Finger Lakes CFW1 Filter wheel

SBIG ST7E guide camera

26 exposures of 5 minutes with no filter

two hours 10 minutes total exposure time

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