Used Ikelite 4035 Auto Flash AF35 Kit, Left Hand Flash Kit with Single Tray Guide, ISO 100, Feet: 28 Surface, 16 Underwater (Red)The AF35's built in sensor transmits data from the camera's flash to the AF35 strobe, varying the strobe's power automatically to replicate TTL exposure. The AF35 sensor is positioned to provide the most reliable strobe triggering possible without exposed cables which require maintenance and can tangle or break. Two large, easy to read dials provide all of the settings necessary for control of the flash system. The AF35 strobe rear dial features OFF,