Breakthrough Photography announces more than 20 drop-in filters for Canon's EF-RF adapter: Digital Photography Review
Buy JJC 58mm Optical Glass Variable ND Neutral Density Filter (ND2-ND2000) for Canon EOS 90D 80D 5DII 5DIII 60D 70D + EF 50mm f/1.4 and Other 58mm Lens Camera, with Moistureproof Filter