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K&F Adjustable Neutral Density Filter ND3–ND1000, 37 mm (KF01.2054)
Summary description:
Adjustable neutral density (ND) filter from K&F, model KF01.2054, fitting 37 mm thread. Provides variable attenuation from ND3 to ND1000 to control exposure, enable longer shutter speeds, and reduce light for video or long-exposure photography. Useful for landscape, motion blur effects, and bright-light shooting where aperture or shutter control alone is insufficient.