5 aperture stops.
The K&F Concept variable lens filter should only be rotated between the edge markings MIN and MAX. MIN refers to ND2 (1 aperture level or 50% light transmission) and MAX refers to ND32 (5 aperture levels or 3.125% light transmission).
The K&F Concept 82 mm ND2-ND32 ND filter is compatible with all camera lenses that require a 82 mm thread diameter. Lens cap and lens hood must be a thread size larger.