The Crescent Nebula (NGC 6888)
Ha - OIII - Blue

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
180 Min H-alpha (2X2) on Red Channel, 120 Min OIII (2X2) on Green Channel, 40 Min Blue (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:
H Alpha Custom Scientific 656.3 / 4.5nm
O III Custom Scientific 500.7 / 3nm
Blue Filter from Standard SBIG RGB Filter Set