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The colour balance is not correct as you are aware of but unfortunately there isn't much you can do about the colour while using a standard DSLR. The DSLR has a slip filter in front of the CCD which does not allow much if any Ha through to the CCD. What it does allow through is a blue colour for the Hathat it manages to pass plus a lot of OIII which is often described as a teal colour (blue green). It still allows detail to be captured and while there has been a lot of discussion about correct colour it is largely irrelevant if you are happy with the detail etc you have captured.
The only real fix is to modify the camera but this renders it largely only suitable for astro work. It can still be used for normal photography but the process is dificult.
Nice image, you should be happy with that.
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