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Duo,tri or quad band filter? - DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging - Cloudy Nights
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OPT just announced their Quad-Band narrowband filter - Page 3 - Beginning Deep Sky Imaging - Cloudy Nights
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Geometry and simulated frequency response of the quad-band bandpass... | Download Scientific Diagram
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Rosette Nebula with OPT Filter Triad Ultra Quad-Band Narrowband Filter ( Andre van Zegveld ) - AstroBin
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You may have a TriBand or QuadBand filter without knowing it. - Beginning Deep Sky Imaging - Cloudy Nights
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