Step-Down Ring Adapter from 82mm to 77mm for Sigma 20 mm 1.8 EX DG DF RF Asp. C
Lens Diameter: 82 mm Filter diameter: 77 mm Material: metal Installation type: screw thread Colour: black Weight: 14 g Compatible with the following device models: Sigma 20 mm 1.8 EX DG DF RF Asp. .