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The Interfit EX300 Flash Head (110V AC) is another step forward in the evolution of the EX flash system. The lightweight, economical monolight gives you a total of 300W/s of power, with precise power adjustment in 1/10 f-stop increments and a 5 f-stop range, providing excellent control over your output. Fan-cooling extends the life of both the 100W modeling light and the user-replaceable flash tube. A built-in slave cell responds to flash or to the optional infrared transmitter, while audible and visual signals alert you when the flash is fully recycled. It even has a program that overcomes the problem of the pre-exposure flash from your camera setting off the flash prematurely. The EX300’s Auto-Dump feature discharges extra power in the capacitors the instant you turn down the power. The EX300 comes with an umbrella reflector, built-in ergonomic handle and a flash tube transport cover