The Urth 40.5mm ND8 128 (3 7 Stop) Variable ND Lens Filter is a high-quality neutral density filter specifically designed for photographers and videographers. With a filter strength of ND128, this screw-on filter allows for a significant reduction in light transmission, providing creative control over exposure times and aperture settings. The filter is ideal for shooting in bright light, as it prevents overexposure while maintaining image quality. With a diameter of 40.5 millimeters, this filter is compatible with a variety of lenses that support this size. The variable ND function allows for flexible adjustment of light transmission, which is particularly useful for achieving various creative effects, such as motion blur or depth of field. The Urth ND8 128 filter is therefore an essential accessory for anyone looking to expand their photographic and cinematic possibilities.