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shaunster

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Image Comments posted by shaunster

    M51 1200

          6

    Looks like your cliiping the black point or very near to it and probably losing some detail because of it. The very dark black backgrounds looks quite unnatural.

    Dark halos around stars indicate over sharpening of the image.

    NGC7000 ha

          8

    Thanks all :)

    Heres the details since some are interested

    Scope = Zenithstar 70 + skywatcher flattener

    Camera = Atik 383l+

    1.25" baader 7nm Ha filter

    Guided with QHY5 + ST80 all on a HEQ5

    7x20min subs

    Deneb

          5

    Looks very noisy yes, but this is why you need loads of subs to overcome this. Also with the DSLR being uncooled and this the middle of summer your images will be additionally noisy

    Deneb

          5

    The nebulosity comes with time, 2 minute exposures on a DSLR and I presume its unmodded wont capture much if any, if you shot at a particulary bright target such as orion M42 then you will see the nebulosity apear, but generally to capture the fainter type backgroun nebulosity ( like that around deneb) then long exposures are needed. If polar allignment is off the image will appear to rotate around its centre, the stars in the centre stay round and the outer ones rotate around it, a bit like star trails

    There is a lot of nebulosity around the star Sadr which is near deneb, if you shot for this and took longer and more exposures then you should see something and the more exposures you get will help smooth the image out. Aim for at least 20 subs at the longest exposure you can get without trailing and then stack and process and see what you get. The more subs you get the easier it is to create a better final image.

    Deneb

          5

    This is the best one you have posted martyn, clean field with minimal gradients. Looking at this it seems you are suffering from some field rotation of the stars, I presume this was unguided but anyway this points to polar allignment being off

    Wide ring

          3

    Mainly due to LP but also I only have a 5 position filter wheel so when I have the narrowband filters in place I cant have all the LRGB in there as well..

  1. Yeh I will keep adding to it, think it needs a bit more blue like you said and will get some more luminence, hopefully with more I can make the background nicer.

    To deal with the stars I used the 'reduce blue halos' tool, one of noels actions, it works but the star colour goes all plain

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