B017ILUTYK Ikan Polarizer 4×5.65 NiSi Polarizing Filter – 4 x 5.65 (Black)

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Linear polarizer
Ultra low color shifting with high quality polarizing film
Strict control over lens surface flatness and parallelism
AGC 4mm thick glass with optical processing technology, coarse gridding, fine grinding, and polishing
Optimized for shooting raw 4K digital images