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Baader 6.5nm Narrowband Filter-Set – CMOS-optimized (H-alpha / O-III / S-II) - (Ultra-) Narrowband / Highspeed - Filters
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Baader Planetarium 36 mm Round Narrowband CCD Filter Set of 3 with H-Alpha 7 nm, SII, and OIII Filters - Free Shipping | High Point Scientific
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