Drone Filter DJI Mavic 3 Pro ND&PL Filter 2 in 1 Kit 4pcs (ND8&PL+ND16&PL+ND32&PL+ND64&PL) Multi Coated HD Optical Glass with Anti-reflective Green Coating

SKU: SKU.2054

Q
Why do the lenses rotate around with the little markers to line up? From what I can see it affects the polarisation but only on or off? Thanks
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