The Drop-In Filter Mount Adapter EF to EOS-R with Variable ND Filter from Meike is a smart option for users of EOS-R mount cameras who want to use EF mount lenses with the added benefit of a variable neutral density filter. The drop-in filter system quickly and easily slots lens modifiers at the rear of the lens, letting photographers use the same size filters regardless of the size of the lens, reducing the amount of gear you need to carry with you. Built with a metal body, the device is fully compatible with Canon EF/EF-S mount lenses. It has gold-plated contacts for autofocus, aperture control, lens image stabilization, and lens data transmission to the camera. The dust- and water-resistant adapter comes with a drop-in variable neutral density filter and an extra holder.