NDT Fusion Auto Adapter - Canon EF Lens to L-Mount Cameras w/ Variable ND – Fotodiox, Inc. USA
MK-EFTE-C Drop-in Filter Mount Adapter EF/EF-S lens to Sony E mount ca — Meike Global
Haida Rear Lens ND Filter Kit for Select Canon EF Lenses HD4568
Permatron EF DUSTEATER Electrostatic Air Filter
Canon Drop-In Filter Mount Adapter EF-EOS R with Variable ND Filter
Amazon.com : Meike MK-EFTR-C VND Drop-in Filter Auto-Focus Mount Lens Adapter for Canon EF to EOSR with Variable ND Filter and UV Filter for EOS R R5 R6 RP R7 R10 C70