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I really like the idea of three groups, but I rarely / never use direct lighting of my subjects. Can I turn OFF the flash output completely of my on-camera 550EX operating as a Wireless Master?

April 26, 2017completely Flash groups IDEA lighting output rarely Subjects turn

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I really like the idea of three groups, but I rarely / never use direct lighting of my subjects. Can I turn OFF the flash output completely of my on-camera 550EX operating as a Wireless Master?

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A6: Yes! Check out page 104 of the 550EX User Guide to find out how, or just keep playing with the Set/Sel button until that menu pops up. You can then turn off the on-camera 550Exs light output altogether. Do NOT use the camera body custom function that adjusts flash firing and focus assist to Emits/Does not fire, since it is the 550EXs main Xenon flash tube that emits the trigger pulses for the Slave Units, and this CF setting disables the main flash tube altogether. This custom function should only be selected if you are using the camera body in low light situations where auto focus is an issue, but you do not wish the flash to fire. It will work with all the Canon flash units right down to the diminutive 220EX, and even this small flash can provide a better AF assist beam than the on camera AF lights provided with the Dxx series bodies.