NGC6888 Crescent Nebula in Halpha from Stinger 450 Classical Cassegrain and FLI Proline 9000 with Baader Planetarium 50 x 50 mm Halpha Filter

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Taken on July 18, 2008 from my backyard in Castro Valley, California

  "Scope City"

Stinger 450 Classical Cassegrain (18" f/12.6)  

Lumicon Giant Easy Guider without Focal reducer for final: F= 5760mm, f/12.6

Finger Lakes Proline PL9000 imaging camera operated at -35C


Finger Lakes CFW4-5 Filter wheel

SBIG ST7E guide camera

Baader Planetarium 7nm  FWHM Ha filter (50 x 50 mm squarer)

Custom Scientific 4.5nm FWHM [OIII] filter (50mm diameter)

6 exposures of 20 minutes through Halpha filter

Two hours total exposure time

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