Stefan Lilge wrote:
I did a Halpha image of NGC 7635 last year and added some RGB this year.
I had to do a 50/50 mix of the red channel and Halpha, otherwise the
image would look washed out with a pink hydrogen nebula.

Taken from the middle of Berlin,
luminance with a C8 at f/7, G11 mount, SXV-H9 camera, 36x10 minutes
through an Astronomik 13nm Halpha filter,
RGB 6x5 minutes each with an 8" LX200 at f/4.4, SXV-H9 camera.

The image can also be found at
http://ccd-astronomy.de/temp/7635colourgut.jpg

Halpha:
http://www.slilge.de/Sharpless/7635-36x10gut.jpg

RGB:
http://ccd-astronomy.de/temp/7635RGBgut.jpg

Stefan

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That came out well. A change from the comet. I tried it again through
thick haze last night, haven't tried processing it yet.

I find if I add a bit of the H-alpha to the blue as well, say about
15%-20%, it helps the color balance. I tried 10% each of blue and green
since the H-beta line is somewhat green as well but prefer thought just
adding it to blue was more "natural". I haven't tried other
combinations as yet. Just adding it to the red gives me too much red and
blue features don't come through or do so as red instead.

Rick

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Third character is a zero rather than a capital "Oh".