Quote:
Originally Posted by Andy01
Looks good Marc!
Two questions if I may-
Are you suggesting that more subs = less noise doesn't work with the moon about?
Do you also experience gradient problems imaging in Ha when the moon is out?
Cheers
Andy
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Thanks Andy. Yes, more subs = less noise. Always. Moon or not. If your sky background is bright it's harder to get your contrast back so by processing out the glow to compensate to get more contrast you'll bring more noise into your final pic. That's what I tend to do when processing "flat" pictures. Boost contrast more and that comes with noise in the shadows and lower mid tones..
You can get gradients and all sort of other reflections, etc... if the moon shines close to the aperture of the fov as well.
I guess it depends on the FL and scope you use as well.
Finally if your filter bandpass is narrower you'll get more contrast. Mine is 7nm. I suspect I'd get better results with a 3nm? But they're expensive and I can't justify the dow for the level of improvement.
Having said that, my 8nm Sii and Oiii are close to useless under my light polluted skies. Then again maybe I don't try hard enough.