I am selling this item because I purchased the wrong type. I attached it to a camera once, but it is almost unused. K&F CONCEPT [Compatible Mount Lenses]: Compatible with Canon EOS lenses. (※Note: This product is not applicable to Canon lenses of the "STM" series, such as EF 50mm f/1.8 STM / EF 18-135 IS STM.) [Compatible Mount Cameras]: Compatible with Canon EOS R camera bodies (R10 is not supported) [MF & Infinity Focus] There are no electronic contacts on the ring, so focus is MF, and aperture adjustment is basically fully manual. Infinity focus is achievable. [Durability & Lightweight] High-quality aluminum alloy with a high-grade surface finish, greatly improving durability. Lightweight and compact, making it easy to carry. [Red Dot Marking] Can be attached by aligning the red dot with the lens mounting index. Easily removed by pressing the button on the adapter. I am not familiar with cameras, so I cannot answer technical questions. Comes with a case. Instant purchase is welcome!