Meike Control Ring Mount Adapter EF-EOS R MK-EFTR-B is a control ring adapter designed to use Canon EF and EF-S lenses on Canon EOS R mirrorless cameras with RF mount. The adapter maintains electronic communication between the lens and camera body through integrated contacts, supporting autofocus, auto exposure, diaphragm control, auto aperture, lens image stabilization, and EXIF data transmission when available and compatible with the equipment used. The customizable control ring allows operational functions such as aperture, shutter speed, or ISO sensitivity to be assigned, providing an interface similar to RF lenses equipped with a control ring. The body is made of metal, with front and rear mounts in SUS304 stainless steel, and is designed to ensure stable coupling between lens and camera. Its compact format, measuring approximately 74.4 × 24 mm and weighing around 130 g, makes it suitable for integration into photo and video kits without adding significant bulk. The Meike MK-EFTR-B also supports firmware updates via USB Type-C, useful for maintaining compatibility with supported camera bodies and lenses. It is an accessory intended for users who own EF or EF-S lenses and want to use them on the Canon EOS R system while retaining electronic functions and advanced operational control.