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In another thread I started about strobes, the thread was getting sidetracked with questions about the SWC corrector lens set. So I decided to start a new thread. The Zeiss corrector lens set is used to correct for the decrease in angle of view due to the physics of water when using the SWC. The set consists of the outside flat port (spherical inside) and the smaller lens that mounts on the camera. Even if you have these two lenses, you also have to have the "gauge" tool to properly set the distance between camera and port and also to ensure that they the camera is perfectly perpendicular to the gauge tool. The camera is set at 10 feet, seated on the gauge tool, and mounted using the SWC mounting screw which allows for adjusting the axial distance. This "guage" tool is screwed in place of the port lens, then removed. My dad never acquired the SWC rear section of the housing. Instead, he removed the prism and would imagine the viewfinder frame. Haha.