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Stacking filters is pretty pointless especially narrowband as they would cancel each other out. Any reason you want 2" filters? Your GT-81 is an F4.7 scope with a reducer so even with 36mm filters you would not vignette. Also if you wanted A high quality filter set (Astrodon??) 2" would be very expensive. If I were you and still wanted 2" I would get the 7x2" filter wheel and a set of Antlia LRGB filters at first and then later buy 5nm Ha and 3nm Sii+Oiii filters. I think they are a step above Zwo in quality and you have the benefit of a tighter bandpass for light polluted sky.
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