Crab Nebula M1 in Taurus


Scope: C8  f/5 Location: Del Mar, CA   11/18/2003  Camera: ToUcam SC3

Exposure: 6 x 150  sec exposure with H-Alpha filter and 18 x 33 sec exposure with IR block filter for Luminance .  15 x 20 sec RGB Exposures

Processing: Captured  and stacked in K3CCDTools  with HA,IR,R,G,B saved as FITs. HA and IR exposures were combined in Photoshop for  Luminance channel; Some HA exposure was mixed in with the Red channel. LRGB masters were co- registered  in Astroart. Some Lowpass filtering was applied followed by un-sharp mask on the Luminance frame.  LRGB combine was done in Photoshop using Luminance Layering . Ears were removed with Loreal; background was smoothed in SGBNR as saved as TIF. The result TIF had minor touch up in Photoshop.

This image was taken in my front yard in Del Mar there is a fair amount of light pollution here. The 10nm bandwith H-Alpha filter was able to pull some contrast out of the sky glow. The image below was processed without mixing any of the HA exposure into the Red channel.   Horizontal FOV is 16'


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