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Baader 3.5 / 4nm Ultra-Narrowband Filter-Set – CMOS-optimized (H-alpha / O-III / S-II) - (Ultra-) Narrowband / Highspeed - Filters
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Baader CMOS-Optimized 3.5/4nm Ultra-Narrowband Filter Set (H-a/O-III/S-II) - 36mm Round Unmounted # FCSETNU-RD36 2961672
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