B07YFWVFND NiSi 100x150mm Reverse Nano IR Graduated Neutral Density Filter – ND4 (0.6) – 2 Stop

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True to life color, No color cast
Perfect to balance the exposure when scenes have a sudden transition from the foreground to the sky
Optical glass for high definition
Waterproof and low reflection Nano Coating
Compatible??with the 100mm NiSi System