NGC7538 Emission Nebula in Halpha from Stinger 450 Classical Cassegrain

8 hours total exposure

click image to enlarge, click here for highest resolution

Taken on September 1 and 4, 2006 from my backyard in Castro Valley, California

Stinger 450 Classical Cassegrain (18" f/12.6)

To see as a tricolor [SII], Halpha and [OIII] image click here:    

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

Finger Lakes CM10 MaxCam imaging camera operated at -20C


Finger Lakes CFW1 Filter wheel

SBIG ST7E guide camera

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

Sixteen exposures of 30 minutes in Halpha

Eight hours total exposure time

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