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Subject
NGC 6888
Date
26th May 2003
Telescope or Lens
Vixen ED102SS
Mount
GP DX
Camera
SXV H9
Filters
TT LRGB and NIR blocker. Schuler 10nm Ha
Total Exposures L 80 min R 20 min G 20 min B 30 min
Sub exposure

1 x 20 min

2 x 30 min

1 x 20 min
1 x 20 min
1 x 30 min
Binning
Luminance 1 x 1 RGB 2 x 2
Field of view and resolution
Approx 46 x 34 Arcminute. 2 Arcsec / Pixel
Comments  
This shot of the Crescent nebula was taken over two nights. The raw frames were first processed in Astroart for bias removal and high pass filtering. The colour and luminance frames were then combined in Photoshop. The Ha luminance and red channels were combined 50/50 and this new image was used as the red in the RGB composite. Finally the Ha luminance was layered onto the new RGB. The colour and contrast were then manipulated using hue and curves respectively. The shot was guided using the Apogee 80mm dia, 900mm focal length guide scope, which produced good tracking and nice star images meaning that little processing was needed. I think that the shot could be improved with longer exposures, particularly the colour elements.