Hiro

Hello, I've recently purchased a ISCO Ultra Star Cinemascope lens to use it with my sony a7s. I've seen some videos on youtube where people use this lens with their cameras so I bought this lens without thinking too much. However, I think I might have bought a wrong lens. As you can see in the picture, there is this lower part of the lens that I don't see in other videos. Is there a way to disassemble this part of the lens or have I just bought a wrong lens? Many thanks in advance