Quote:
Originally Posted by multiweb
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.
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Thanks Marc, that all makes sense!
I have 5nm Astrodons and a 110mm/ 660ml refractor. I have often imaged from my Melbourne suburban backyard in NB under both LP & Moonlight.
I recently experienced poor results on a recent attempt at the Cat's Paw with the moon close to the nebula. Three night's data was collected but an unresolved, incomplete image, dreadful gradients and nightmare processing were the result - I'm a bit gunshy of shooting under the moon now!
Maybe it's best to choose targets at least 90degrees away from the moon
