Sigma Drop In WR Variable ND RND-21 Sony E-mount

Sigma Drop In WR Variable ND RND-21 Sony E-mount. A drop-in variable ND filter that allows effect adjustment via dial while attached to the lens. It enables up to 7 stops of light reduction to achieve slower shutter speeds without excessive stopping down, making it ideal for panning shots in motorsports photography. Compatible with: Sigma 300-600mm F4 DG OS Sports E-mount.