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You won't get much out of most filters, Chris. They are of limited use even on large aperture scopes. The ND by itself should make a good Moon filter for your 6" scope, if you don't like the green colour of the standard Moon filter. Colour filters are pretty useless IMO. You will use them once or twice and that's it. A narrowband nebula filter might be of some use for cutting down light pollution around gaseous nebulae. I have the DGM NBP filter (which is said to be one of the best of its kind) you can try in your scope and see what you think.
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