martin_h Posted October 19, 2014 Share Posted October 19, 2014 Go on then give us a clue?..................single 20 mins sub, QHY9 + Ha filter. Flats show the usual dust and grot but not that! Link to comment Share on other sites More sharing options...
martin_h Posted October 19, 2014 Author Share Posted October 19, 2014 Sorted - I think, a band of moisture across the chip. Link to comment Share on other sites More sharing options...
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