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Hi Roger - just wondering if you're seeing thin, high level cloud in there, as the focus looks a bit soft, and there's been an awful lot about recently.
I'd be surprised if it was chromatic aberration, as that would normally give you a blue halo - I think it would be tricky to focus red and blue, but not green?
The other theory about the extra amount of green due to the Bayer matrix configuration might be worth following up too. I would assume if the images were debayered then registered (which is how I do osc processing) that it's not subframe misalignment either.
Interesting.
Cheers,
Andrew.
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