IC 1396

Here is my first try at the elephant trunk Nebula. Due to my long focal length, I was just able to fit the most notable part of the Nebula into my frame.

These are 23 x 15 minute frames stacked in Deep Sky stacker and processed in Pixinsight. I’m very glad I modified my dslr as I would never be able to capture that much HA with a stock dslr.

I use Astrophotography tool to control my dslr, I also dithered a little in between exposures.

2 Responses

    1. Thank you. I use the dynamic background extraction in pixinsight, I set the tolerance to 2.000 and the shadow relaxation to 6.000. I also set the sample radius to 150.

      First I do a rough division and subtraction with the sample points only around the edges of the image. Then I do the auto stretch and dynamic background extraction again this time with the sample points around the main nebulae (not touching it) then I roughly see the faint nebulosity around the image and try my best to delete/move the sample points so that they’re not on the most visible outer nebulosity.

      Of course some sample points will still cover the faint nebulosity but that won’t really matter. You may have to use a smaller sample size. I use a range from 150 to 50.

      After that I do my colour balance using the auto colour script available as an additional extension to download for free. When I stretch my image to bring out the details, I use the extract Cie L* component to get a luminance mask. I then separately stretch this mask and then apply it to the image so it’s protecting the black sky, but not the Nebula.

      Hopefully this will help you with bringing out that faint outer Nebula and keep the background sky black at the same time. I find that when this doesn’t work for me, I usually need to collect more data.

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