The Canon Drop-In Filter Mount Adapter EF-EOS R is a unique and sophisticated lens adapter that allows you to extend the range of compatible lenses, meaning that you can attach any of your EF or EF-S-mount lenses to the Canon EOS R mirrorless digital camera. The adapter allows compatibility with select A-type drop-in filters, that also includes a circular polarizer filter, which contributes by increasing the saturation and contrast and to reduce unwanted reflections. The Drop-In Filter Mount Adapter design makes it possible to use filters with existing lenses that cannot accept filters on the front, and still it retains full autofocus, image stabilization capabilities of the mounted lens. Additionally, the mount adapter is dust and water resistant, making it ideal to perform in harsh weather conditions.