The recommended way to transport the Cooke S4 lenses is horizontally in a carrying case. The reason is, some of the Cooke S4 lenses have a fairly heavy optical unit and if they are standing up (with the optical axis in a vertical position), they can be jolted from a drop of the case on a hard surface. The cam follower can be damaged and in the more severe cases the cam can be dented and may require a factory replacement.

With the lens lying down ( the optical axis in a horizontal position), the cam follower is not subjected to the same stress in the case of a similar drop and the bearings supporting the lenses in that position are much more resistant to impact.

However several inches of chock absorbing foam are recommended to minimize the impact in case of mishandling.