Quote:
Originally Posted by [1ponders]
Nice pic Gary. Looks pretty damn fine to me. 
While I haven't tracked down a G2V star like Clive's planning, (maybe I should  Go for it Clive, I'm looking forward to seeing how you go. You may just start the end of the eternal discussion  ) I do use the colour balance process described by R. Scott Ireland and it seems to do a pretty fine job. From the look of yours I'm guessing you used a similar process. Correct? |
The G2V stars give a good starting point. I have imaged some with both my little CCD and my 40D. It works well for the CCD but less so for the 40D bacause of the poor Ha sensitivity. Ha doesn't make up much of the spectrum of the G2V stars so the balance is still incorrect on images that contain lots of Ha.
I haven't tried it (I don't have a Ha filter) but probably if you took a normal colour image and balanced it via a G2V star and then took the same image through an Ha filter then added that data in as extra red you would get a more accurate rendition of the colour.
I reality, I don't think it matters. It's important for science images but unimportant for pretty pics.