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Canon Drop-In Clear Filter A Review
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
Breakthrough Photography announces more than 20 drop-in filters for Canon's EF-RF adapter: Digital Photography Review