The Meike MK-EFTR-C Drop-In Filter Mount Adapter allows the mounting of Canon EF lenses on Sony E-Mount camera bodies. This adapter features gold-plated electrical contacts that ensure complete electronic communication between the lens and the camera, supporting autofocus, aperture control, ISO settings, and EXIF data transfer. The adapter system includes a primary EF-to-E-Mount adapter body with an integrated drop-in filter slot, as well as two drop-in filters: a clear protection filter and a variable neutral density (VND) filter with an adjustable density range from ND3 to ND500. Made from durable metal and high-quality plastic components, the adapter measures 72 mm in diameter and 26.7 mm in length, with a total weight of 110 g. The drop-in filter design allows users to insert filters directly into the adapter body instead of attaching them to the front of the lens, maintaining compactness and reducing potential vignetting with wide-angle lenses. The variable ND filter provides precise exposure control across various lighting conditions, from bright sunlight to controlled studio environments, while the clear filter offers protection for the camera sensor and rear lens elements. This adapter solution retains full electronic functionality while providing the flexibility of interchangeable filter options within a single compact unit, making it suitable for photographers looking to expand their lens compatibility between Canon and Sony systems without sacrificing optical quality or electronic control capabilities.