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Amazon.com : Canon Drop-in Filter Mount Adapter EF-EOS R with Circular Polarizing Filter : Electronics
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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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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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JJC Lens Mount Adapter Converter Replaces Canon Drop-in Filter Mount Adapter EF-EOS R with Variable ND Circular Polarizer & UV Filters for EF/EF-S Lens to RF Mount Cameras EOS R RP R3
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