+Graham Posted May 14, 2013 Share Posted May 14, 2013 Well after it finally stopped raining last night I decided to grab another go at the Bubble neb. I have raised the sub length to 600 seconds for this one. Due to the weather I only managed 12 subs. Helios 127mm frac Atik 314 L Stacked in Maxim No flats or darks Processed in PS 6 I did try to add this lot to my other data from the other night but it was having none of it for some reason. Link to comment Share on other sites More sharing options...
Guest T A WOW Posted May 14, 2013 Share Posted May 14, 2013 Very nice. Why do you get diffraction spikes in the image? Particularly noticeable in the large star at about the 11 o'clock possition from the bubble. I didn't think refractors gave diffraction spikes. Link to comment Share on other sites More sharing options...
+Graham Posted May 14, 2013 Author Share Posted May 14, 2013 Hi Tobias They are not defraction spikes I think it is caused by the exposure length being too much for the bright large stars. That along with the basic optics on my scope. Link to comment Share on other sites More sharing options...
Guest T A WOW Posted May 14, 2013 Share Posted May 14, 2013 Ah. Ok. Link to comment Share on other sites More sharing options...
+Ibbo Posted May 14, 2013 Share Posted May 14, 2013 they are more than likely the spacers for the front lens Link to comment Share on other sites More sharing options...
+Graham Posted May 14, 2013 Author Share Posted May 14, 2013 they are more than likely the spacers for the front lens you could well be right there Steve. I did paint them black when I overhauled this scope, maybe they need trimming down a bit, or I could make up a ring to go in front of the lens cell to cover them up. It would reduce the aperture by a couple of mm but if it cured this problem the benefits would outweigh the loss. Link to comment Share on other sites More sharing options...
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