M57 Ring Nebula in Halpha

Click image to enlarge, click here for highest resolution

Taken on July 8, 2006 from my backyard in Castro Valley, California

Stinger 450 Classical Cassegrain (18" f/12.6)

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

Finger Lakes CM10 MaxCam imaging camera operated at -26C

Robofocus

Finger Lakes CFW1 Filter wheel

SBIG ST7E guide camera

Custom Scientific 3nm FWHM Ha filter (50mm diameter)

Six exposures of 15 minutes

One and a half hours total exposure time

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