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In many ways, this image is very close to the one that won the Royal Observatory Greenwich's Astro Photo of the year for 2009 (with one obvious difference being this is in Ha and it was colour). But the interesting thing it deminstrates is the significant enhancement in contrast and hence in detail that Ha seems to make possible. The winning image was praised for its "delicate wispy detail around the horse's head and mane". Having compared the two in that limited respect, it seems to me that Paul's image is even more subtly detailed and executed. Makes me want to have a play with narrowbanding.
Peter.
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