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Old 08-02-2013, 12:38 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
You could use artificial flats -or pixinsight's gradiant remover...
There's lots of processing hints over on the new Solar Chat forum - well worth a visit!
http://solarchat.solarastronomy.org/index.php/en/
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