Breakthrough Photography announces more than 20 drop-in filters for Canon's EF-RF adapter: Digital Photography Review
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Amazon.com : 2 Pack EF to RF Mount Adapters Side Cover Cap for Canon Drop-in Filter Mount Adapter EF-EOS R Converter Only Replace Clear CPL Variable ND Filter A Anti-Dust Anti Light
Meike MK-EFTR-C Drop-in Filter Mount Adapter EF to Canon EOS R RP R5 R — Meike Global
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Custom 3-Filter Case Only for Canon Drop-In Filter Mount Adapter EF-EOS R (RF) | eBay