Kenko Variable ND 49mm PL Stepless Adjustment with Made in 933763 Filter, FADER, ND3-ND400, Lever, Japan,

[Variable ND filter] ND (neutral density) filter that can be adjusted continuously between ND3 and ND400 [Multiple ND filters in one] You don't need to carry around multiple ND filters; this one filter can serve the role of multiple ND filters. [Variable ND for quick light intensity adjustment] Extremely useful for adjusting differences in light intensity that occur when the brightness changes significantly during a single shot or when changing scenes during video or movie shooting. Prevents overexposure and whiteout: In bright conditions, shooting at full aperture with a large aperture lens such as f1.2 can cause overexposure and whiteout. By using the PL Fader, you can flexibly adjust the amount of light reduction depending on the shooting situation, preventing overexposure. [Easy operation with rotation lever] A dedicated lever can be attached to the filter frame, so you can rotate it with one hand while looking through the viewfinder.