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Narrowband Luminance
Hi all,
For the past few weeks I have been slowly collecting narrowband data for my next image of the Helix Nebula.
So far I got st.dev. for background at 1.5 ADU for Ha master and 1.3 ADU for OIII master.
While I predominantly use Ha for Luminance in my images, I thought that including OIII will help to show more interesting features. I tried doing ImageIntegration without rejection on Ha and OIII masters, and while noise in the background dropped to about 1.1 ADU (st.dev.), strong OIII signal around the core has made some of the knots barely visible. Perhaps when I compose the final colour image, those features will become visible again?
Is there a better way of combining narrowband masters into a synthetic luminance, or perhaps I will be better off with just Ha as a luminance for the Helix? My goal is to show as many structural features as possible, given modest 4" aperture.
The attached image shows synthetic luminance on the left (OIII+Ha) and Ha master on the right.
Any comments and suggestions will be highly appreciated.
Suavi
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