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You have set yourself a very difficult task indeed, 24 minute sub with
such a long focal length scope; as a result, your stars are elongated.
Much better to use MUCH shorter subs [say 5 mins or so], and stack them, until you have got your guiding down pat.
Looks like your focus is a bit off, how are you doing it?
Even with a very slow scope the nebula should show stronger colour.
I don't know what is going on there, as the stars are showing strong colours.
Also, you seem to have a lot of coma in the outer part of the field.
I have attached an old image of mine that shows the colour that your image
should display. As DJT stated, try 800ISO.
raymo
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