Canon Drop-In Filter Mount Adapter EF-EOS R with Circular Polarizing FilterCanon Drop In Filter Mount Adapter EF EOS R with Circular Polarizing Filter Canon SKU: 3442C002 Helix SKU: CA3442C002 Overview 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 circular polarizing filter, and because it's one