Sigma Drop In WR Variable ND RND-21 300-600mm f/4 DG OS L-Mount

This Drop-In VND Filter from Sigma is designed for their 300-600mm f/4 DG OS Sports Lens to help expand the possibilities of your lens. The filter features a rotating knob for adjustment, allowing you to reduce the exposure across your entire frame by up to 7-stops of light, making it ideal when shooting things like sports or landscapes.