The Crescent Nebula (NGC 6888)
SII - Ha - OIII
Hubble Mix

Ha - OIII - B

Ha - OIII - OIII

Hubble Mix (S II - H alpha - OIII)

Ha - OIII - SII

Date: September, 22,23 & 29, 2003, October 1 & 2, 2003
Instrument: 155mm Astro-Physics f7 Starfire @f5.25 w/Astro-Physics 1200 Mount
Imaged with SBIG ST2000XM Camera w/CFW8A Filter Wheel
Exposure: HaRGB
120 Min SII (2X2) on Red Channel, 180 Min H-alpha (2X2) on Green Channel, 120 Min OIII (2X2) on Blue Channel
Gradient Reduction with Ron Wodaski's Plugin on OIII image only in MaxIM DL
All sets were taken with 30 minute sub-exposures
Sub-Images Aligned and Combined in CCD Soft
Color Combine in CCD Soft
Gamma Stretch and Background Subtraction with Pixel Math in MaxIM DL
Slight Color Adjustment and Cropping in Picture Window Pro
Curves applied in PhotoShop 7.0
Location: My Light Polluted Driveway in Mason, OH

Guiding:
94 mm f7 Brandon with SBIG ST4

Filter Data:
S II Custom Scientific 672.4 / 4.5nm
H Alpha Custom Scientific 656.3 / 4.5nm
O III Custom Scientific 500.7 / 3nm