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Orpington Astronomical Society

Astronomy => Astrophotography => Topic started by: The Thing on Sep 09, 2016, 13:48:58

Title: Cygnus area, probably Sadr. Duras, SW France, 07092016 02:30 CET
Post by: The Thing on Sep 09, 2016, 13:48:58
Used my Skywatcher StarAdventurer mount on EQ6 tripod. 45min - 9x300s@ISO1600 using Canon 1100D defiltered and photographic UV filter (which seems good at stopping star bloat). Very quickly processed in DeepSkyStacker, no flats, darks, bias. Full size version looks iffy, I think I overstretched something as the stars have dark centres.

(http://gallery.orpington-astronomy.org.uk/albums/userpics/10050/normal_Cygnus_Duras_45m_105mm_f5_6_v2_av.jpg) (http://gallery.orpington-astronomy.org.uk/albums/userpics/10050/Cygnus_Duras_45m_105mm_f5_6_v2_av.jpg)
Title: Re: Cygnus area, probably Sadr. Duras, SW France, 07092016 02:30 CET
Post by: Carole on Sep 09, 2016, 16:14:04
QuoteI think I overstretched something as the stars have dark centres.
Your small stars have holes in them, I have seen this before.  Either focus, which I don't think this is.  The other culprit is the cosmetic tab in DSS.  I hardly ever use DSS now, but when I did/do I make sure the cosmetic tabs are set to as low as you can go.  It has a habit of star eating otherwise.

Carole
Title: Re: Cygnus area, probably Sadr. Duras, SW France, 07092016 02:30 CET
Post by: The Thing on Sep 09, 2016, 16:16:23
Aha, yes my Cosmetics are set to 2 pixels. Thanks Carole.
Title: Re: Cygnus area, probably Sadr. Duras, SW France, 07092016 02:30 CET
Post by: MarkS on Sep 14, 2016, 22:21:32
Yes, those stars are quite weird looking  :-?

Mark
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