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Sorry Merlin, I should have said that it's the emission nebula around NGC 1910. The cluster itself was not bright enough to register on my shot, but the nebula has.
Edit: Now I'm not so sure! The nebula has very faintly given a blue patch, but the H-alpha 'blob' isn't there. Went back to the full-size image and can't really find anything. Maybe I'm not looking in the right spot...
Cheers -
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