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filtro nd/neutral density filter variable / para que serve?

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XCSourece 24pcs Full ND2/ND4/ND8/ND16 + Graduated G.ND2/G.ND4/G.ND8 Filters + All Colors Full & Graduated Filters + 9 PCS Adapter Ring（49mm,52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm） + 2 PCS Filter Holder + 2 PCS Lens Hood +3 PCS Cleaning Cloth for Cokin P