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The green is fairly normal. I certainly wouldn't have bought an OIII for visual use. It is a very narrow band filter which only allows a very narrow band of light to pass. It is used quite a bit for CCD imaging and is used to capture this narrow band of light but in a black and white format the colour is applied by photoshop or similar program.
A better filter for visual use would have probably been a Light polution filter or a UHC which will darken the background and increase the contrast on most nebulas.
Sorry to stuff up your day but I think you may have made the wrong choise in this instance.
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