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What are the differences between the ST-E2, and a 550EX used in Master Mode?

April 26, 2017differences master mode st-e2 Used

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What are the differences between the ST-E2, and a 550EX used in Master Mode?

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A5: Probably the biggest difference between the ST-E2, and the 550EX used in Master mode is the number of groups controllable by each. The ST-E2, being based on older (circa 1998) technology, can control only two unique Groups, A, and B, whereas the newer 550EX, when used as a Wireless Master is able to control three unique Slave IDs: A, B, and C. There is also the difference of size, and weight: The ST-E2 is a tiny little box (smaller that the diminutive 220EX flash head), and adds virtually no weight to your camera body. If you do not need the feature of a third group for ratio control, you will likely prefer the profile of your camera with the ST-E2 attached. Also, I like the speed, and simplicity of the ST-E2 user interface.