Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent Nebula  ·  NGC 6888
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NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars, Kris Inman
NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars
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NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars

Getting plate-solving status, please wait...
NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars, Kris Inman
NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars
Powered byPixInsight

NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars

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Description

The image was shot using a new (to me) technique which uses a quad-band narrowband filter as luminance and a combination of Ha, OIII, and SII single band filters for RGB channels. The stars were screen from red, green, blue filters. 

The blend of Ha, OIII, and SII were:
R: 0.2*SII + Ha*1.0
G: Ha*0.1 + OIII*0.9
B: OIII0*.85 + Ha*0.15

In "theory" this method delivers more than double the light capture, and ~1.5x the SNR, in the same amount of acquisition time. Seven filters is a lot of process, but I'm happy with the results.

Note, I had to upload a jpeg version of the image due to the file size constraints.

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NGC 6888 - Crescent Nebula - Quadband + Ha, OIII, SII filters + RGB stars, Kris Inman