Can a Fuji X100T’s built-in flash trigger a Canon 600EX-RT off-camera?
Asked 11/25/2014
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I have a Fuji X100T and a Canon 600EX-RT Speedlite. Can the Fuji’s built-in flash trigger the 600EX-RT as an optical slave, or are they incompatible? If it can work, would it need to be manual only, and do pre-flashes matter?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
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You can buy cheap flash triggers that will trigger a flashgun via a PC cable or hotshoe adaptor. They just look for a flash of light, then trigger the connected flash. May be enough for you if you're using the Speedlite in manual mode and the Fuji is only generating one flash (any pre-flashes for red-eye reduction, or ettl metering would need to be disabled)
Here's one I used to use with an old flashgun:

The Flash Light Slave Trigger bit has a PC socket on the back so can be connected to trigger any hot-shoe flash gun with the PC to hot-shoe adaptor also in the picture.
You can also get the flash slave trigger built right into a hot-shoe adaptor e.g.
SYK-4 Wireless Hot Shoe Flash Remote Controller Slave Trigger w/ PC Sync Socket-eBay
Originally by user34468. Source · Licensed CC BY-SA 4.0
user34468
11y ago
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Not directly. The Canon 600EX-RT does not have a simple built-in optical slave mode that fires from any flash burst. Its wireless optical/radio modes are designed for Canon’s own flash system, which the Fuji X100T does not speak.
You can still make it work off-camera in manual mode by adding a separate “dumb” optical slave trigger to the 600EX-RT (via PC sync or a hot-shoe adapter). That trigger simply sees a flash and fires the Speedlite.
Important: this only works reliably if the Fuji’s flash emits a single flash. Any pre-flash for TTL metering or red-eye reduction can trigger the slave too early, so those modes need to be disabled.
Other manual options include radio triggers or a sync cable. In short: Fuji built-in flash to 600EX-RT directly, no; with an external optical slave or other manual trigger, yes.
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