Brad,
I believe the best option is a polarizing filter. With my 14" scope a 13% ND filter is too bright for my eyes. I gave a try to the Antares 1.25 variable filter (got it from scopestuff.com), the polarizing feature was very good, I could make it as dim as I needed, but the optic quality was very disappointing. I'm still looking for a good polarizing filter for my scope.
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