Original Germany B+w 810 Nd1000 67 72 77 82mm B+w Nd1000 Mrc Ultra Thin Neutral Density 10 Stop For Camera Nd1000 Brass Material - Camera Filters - AliExpress
Amazon.com : B + W 67mm XS-Pro Vario Neutral Density MRC Nano Filter - 0.3 to 1.5 (1 to 5 Stops) : Electronics
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Here are 12 ND filters compared for color and sharpness
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Original Germany B+w 810 Nd1000 67 72 77 82mm B+w Nd1000 Mrc Ultra Thin Neutral Density 10 Stop For Camera Nd1000 Brass Material - Camera Filters - AliExpress