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I use the other version of the same thing as Nik. Mine is an STC Duo Filter. I image in bortle 8 skies but I think even calling it an 8 is generous. I use it on an astromodified Canon 350d. I can image happily up to about 70% moon and up to 5 min subs where I start getting amp glow anyway, well before LP wash out.
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