First, the K&F Concept ND2-ND400 lens filter allows you to change the shutter speed based on the desired effect with the best sensitivity and the same aperture. Second, the K&F Concept ND2-ND400 lens filter allows you to create a blurred background with a large aperture while keeping the shutter speed the same. Third, K&F Concept's ND2-ND400 lens filter is designed to prevent overexposure while maintaining image purity and quality. *Like a zoom lens, the variable final filters are suitable for multiple shooting situations. If you are looking for perfect image quality, a fixed ND filter is recommended.