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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
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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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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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1KIND Photography: Complete 3rd Party Adapter List: Canon EF to EOS R (RF) Lens Mount Adapter Mirrorless Cameras
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Amazon.com : NEEWER EF to EOS R Mount Adapter with Drop in Variable ND Filter ND3-ND500, Autofocus Lens Converter Ring Compatible with Canon EF/EF-S Lens to EOS R EOS RP EOS R5
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