K&F CONCEPT 18pcs 37 82mm 82 37mm Lens Step Up Down Ring Filter For Canon Nikon all camera DSLR 37 49 52 55 58 62 67 72 77 82mm|filter adapter|filter ring adapterring adapter - AliExpress
NiSi 82mm Adapter Ring for V6 100mm Filter Holder NIP-V6-AD82
Photospecialist - Heliopan Adapter Ring Optic 72mm, Filter 82mm