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Good stuff mate! You weren't imagining the features you saw in NGC 1535, as I can confirm that the interior of the inner section does feature distinctly uneven brightness. This is one to catch in excellent seeing and go insane on the magnification!
You saw IC 418 as purplish....sounds like you are getting the colours which gave it the moniker "Raspberry Nebula". Interesting observation here, it seems it presents a different colour to whomever observes it, I see it as white, and I think it was Malcolm who reported a bluish hue. Could be that our eyes are more/less sensitive to certain wavelengths, or maybe sky darkness or equipment plays a role?
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