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The Arcturus 2" Neutral Density 13 (ND13), transmits 13% of all incident light, while blocking 87%. For lunar observing with 8" (200mm) and larger telescopes. Arcturus Neutral Density Filters are made from renowned Schott and Hoya optical glass and allow for maximum contrast on viewing planetary and lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides, these filters are 100% guaranteed for life.