Quote:
Originally Posted by Startrek
My green cast on the Sydney sub is definitely Light Pollution with a bit of moon glare thrown in.
I never ever get a heavy green cast on my subs down south under Bortle 3
When the moon is heading towards full , there’s a slight cast but not heavy green
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Thanks Martin. That's a significant difference, and an excellent like-for-like comparison. Light pollution is the scourge of the skies for astronomers. My Bortle 5-6 skies aren't much chop but I'll take what I can get
I have a lot of trouble balancing out the green when using my filters. I guess that they're rejecting most colours other than green, and the OSC camera being more sensitive to green isn't helping at all. My 12yo daughter likes viewing with me and has a better touch for balancing the image as it evolves.
Maybe part of the equation is the sub duration. Not sure on that score but I might experiment further. Certainly, only using an IR gives much better colour balance at the expense of exposing sky glow rather than rejecting it. What a tricky business this is!
I shot an image of the same nebula using my C9.25 at f/6.3 (a comparative zoom shot) using an OIII and there was so much more to see compared to not having a filter, but the colour was terrible
