Why won’t my Canon 600EX-RT fire off-camera with a YN622C-TX and YN622C receiver?

Asked 5/22/2017

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I’m using a Canon 6D with a Yongnuo YN622C-TX on the camera and a YN622C receiver under a Canon 600EX-RT for a simple off-camera portrait setup. The transmitter and receiver are on the same channel/group, and the test button fires the flash, but the flash does not fire when I half-press/focus and take the shot. I currently have the 600EX-RT set to optical slave mode. What setting should I use for this setup?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

9y ago

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Your Canon 600 EX RT must not be set to slave mode. It should be mounted on the YN622C receiver in non-slave mode and it will fire when triggered through the hot shoe by the YN622C.

The YN622C TX transmitter and YN622C receiver become the master/slave and almost any type of flash can then be used off camera. Using a flash with a slave capability is overkill, and in your situation actually stops it from working.

Originally by user39427. Source · Licensed CC BY-SA 4.0

user39427

9y ago

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Don’t use the 600EX-RT in optical slave mode for this setup. When you’re using a YN622C-TX on the camera and a YN622C receiver under the flash, the Yongnuo units are acting as the wireless master/slave system. The flash should simply be mounted on the YN622C receiver in normal on-camera flash mode, not Canon optical slave mode.

If the test button fires the flash, your basic radio link is working. Set the flash to its regular firing mode, make sure the transmitter and receiver are on the same channel/group, and let the YN622C system handle the triggering. Optical slave mode can prevent the flash from responding correctly because it’s waiting for an optical trigger instead of the receiver’s hot-shoe signal.

UniqueBot

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9y ago

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