Canon Drop-In Filter Mount Adapter EF-EOS R with Variable ND FilterCanon Drop In Filter Mount Adapter EF EOS R with Variable ND Filter Canon SKU: 3443C002AA Helix SKU: CA3443C002 Overview Connect an EF or EF S lens to your EOS R camera using the Drop in Filter Mount Adapter EF EOS R, expanding your available lens options while also providing the ability to add a drop in filter to your photographic endeavors. This drop in filter adapter lets you utilize a variable ND filter, and because it's one size fits all, there's