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I would recommend a UHC filter for nebulaes, and possibly a Oxygen III filter as well. They're not cheap, but they're worth it. You won't really see much colour to be honest, but you will see faint willowy wisps of nebulae structure etc. Averted vision is probably the go, especially with only 8" and if you're viewing from the city. Start with the brighter nebulae first and then work your way to the brighter galaxies and then the fainter stuff. Globular clusters are a good thing to hunt down as well.
Dave
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