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Vizelex ND Throttle Lens Mount Adapter - Canon EOS EF (NOT EF-S) DSLR Lens to Canon RF Mount Mirrorless Camera Body with Built-In Variable ND Filter (1 to 8 Stops) – Fotodiox,
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Breakthrough Photography announces more than 20 drop-in filters for Canon's EF-RF adapter: Digital Photography Review
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Canon EF-EOS R Drop-in Filter Mount Adapter with Drop-in Variable ND Filter A for sale online | eBay
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Mount Adapters | Drop-In Filter Mount Adapter EF-EOS R with Drop-In Variable ND Filter A | Canon USA
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