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NGC  6888,  The Crescent  Nebula

in  Hydrogen - alpha light

   This grayscale image shows the fine internal structure of the Crescent Nebula. The color image using this image for the luminance layer is here.



 2003 August  24


 RCOS Ritchey-Chretien 12.5 inch at f4.5 on AP 1200GTO mount, guided with ST-4 on

 guidescope.  Camera: SBIG ST-10XME at -15 C and CFW-8a color wheel, controlled with 

  MaxIm DL/CCD.


 Luminance = H-alpha 3 x 20 min + 6 x 10 min, 3 nM filter.


 Frames calibrated and combined in MaxIm and debloomed with the CCD-NewAstro

 Debloomer. The Ha-luminance layer was subjected to DDP processing in MaxIm.  Final

 processing with Levels and Curves in Photoshop.

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