What lens did Zhang Xinyi use when taking photos at the Moroccan hotel?

This is a Sony A7 mirrorless camera. There is a wide and heavy adapter ring behind the lens used, which means that the lens used should be a SLR lens instead of a non-reflex lens, which basically excludes the Leica M head.

This lens has an arc-shaped concave focus ring, which proves to be an older lens. There are similar lenses in Fu Lunda, as well as similar works with focal lengths of 35mm and 50mm, but the photos are not very clear, so it is difficult to confirm the specific model.