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without the curve spike

Magnetic X4 UV ND "unavailableText": "Unavailable" } } }A Magnetic Adapter Ring is essential for using Mark II Magnetic Filters. Click here to learn more. Critically Sharp SCHOTT B270 The X4 features SCHOTT Ultrawhite B270 optical glass made in Germany. Our state of the art multi resistant coating has 16 layers (MRC16) which increases light transmission to 99. 4% and creates a protective layer that's structurally harder than the glass. The forefront of Nano Coatings built into both sides. Our breakthrough