B01N5C2MU2 B+W 52mm Xs-Pro Neutral Density 1.8-64x Multi-Resistant Coating Nano (806M) Camera Lens Truer Neutrality – Full-Size, Gray (66-1089222)

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Reduce light by 6 Stops
Allows more extreme effects than lower densities
MRC coating 8 layers per side
The ND filter effect has been greatly improved