This Super Dark Variable Neutral Density Filter Kit by Syrp includes a 67 mm variable neutral density filter that provides exposure reduction from 5 to 10 stops. The neutral density range from 1.5 to 3.0 darkens the entire image, allowing for shooting with a wider aperture or a slower shutter speed. The degree of density is controlled by rotating the front ring of the filter, facilitating the required additional increase in exposure. With a slower shutter speed or a wider aperture, you have better control over the depth of field and can capture the motion of subjects.