This is a Carl Zeiss Sonnar 300mm f4 telephoto lens for Pentacon Six. The lens has signs of mold and coating deterioration. The helicoid and other functions work fine, but the aperture blades do not respond when stopped down from f/16. Therefore, please consider it as junk. This lens is not very common. Includes hood and front cap. It's for P6, so it supports the medium format image circle, and adapters for full-frame cameras are relatively easy to find. It is not for E-mount in the category.