Purchased from Henry's Camera. Cokin Variable Density Neutral Gray Filter for 77mm Thread. Fits any brand of lens with 77mm front thread such as the Nikon 70-200mm 2.8 or the 24-70mm 2.8. Rotating ring to set the density from ND2 (1 f-stop) to ND400 (8+ f-stops). In excellent like new condition. SO awesome for photography in direct sunlight. Will ship if buyer covers the cost.