Quote:
Originally Posted by RichardJ
Hi Greg,
I've also noticed the issue with the green. Thanks for the advice. Much appreciated.
RichardJ 
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TBH there is always a green cast close to the horizon, even more prominent when it fogs up or gets cloudier. Sky glow is also present. I would only worry about green cast on a long FL shot up ahead but wouldn't worry about it on a short FL widefield shot.