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NiSi 180X180mm Square Neutral Density Filter,IR ND8(0.9),ND 3 Stops 180mm System Optical Glass Filter specially for Canon Lens EF 11-24 f/4 L USM
The optical glass (H-K9L) is cured by a fine annealing process and a double sided optical grinding and polishing process help to ensure a quality high definition rating.
NiSi filters are precision cut, polished and optically processed to allow for extreme flatness and high parallelism for the highest quality glass, image quality and image crispness.
Nano attenuation coating,Water&oil repellent coating,Ultra low color shift,Ultra low reflection
NiSi square IR ND filters are not only coated but we have also added a Japanese fire-proof foam gasket to ensure there is no light leakage.
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