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Further to Peter's concern re the nature of the noise in the 1600 images, decided to have a closer look. The attached crops show part of a sub with linear "stretch" so that the bottom 0-4000ADU fill the screen DNR and also a 0-2000ADu version.
Then the light suddenly went on - this noise looks different to that which we normally see because there is practically no camera noise at all. This is what shot noise looks like in a narrowband image - more signal gives more noise and there is no camera noise (dark, read, FPN) to degrade the darker areas. I didn't think that I would ever see the day when we would have access to a high QE, essentially noise free camera - but here it is. And it is affordable. woohoo
Last edited by Shiraz; 15-06-2016 at 12:46 PM.
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