77mm NDX Variable Neutral Density Fader Filter (ND2–ND1000) — Fits Sigma 10-20mm f/4-5.6D EX DC HSM

A 77mm NDX variable neutral density fader that gives you flexible exposure control from ND2 to ND1000 without swapping glass. Built with multicoated glass to help maintain image quality, it lets you adapt quickly to changing light conditions. Rotate the outer ring to select any amount of density across the range, saving time compared with adding or changing separate filters. Designed to work with the Sigma 10-20mm f/4-5.6D EX DC HSM, this variable neutral density filter lets you dial in the precise attenuation you need scene to scene.