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FWIW, for me the most impressive filter for visual in 8-12" Newts (occasionally larger) were a UHC type - DGM narrow band pass nebula filter. Not a fix for light pollution though. Neb filters are actually much more impressive under dark skies in larger scopes. You'll see some cool stuff if you use them in binoviewers (again, it won't do that much good except under clear dark skies).
For showing non-astro folk the Moon a neutral density filter or crossed-polarisers can be useful also.
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