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I'm using a Canon 430EX II with a 6D camera. Can I use the flash as a slave with the Yongnuo YN-622C-TX without any transceiver attached to the flash? I'm really looking for the cheapest solution to use the high sync option of the flash wirelessly. Any advice is appreciated.

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No. The 430EXII does not have a built-in receiver for the radio signals the YN-622C-TX transmits. You'll need to purchase a YN-622C transceiver to use as a receiver on the foot of the 430EXII.

The only Canon flashes that have radio receivers built in are the 600EX-RT and the 430EX III-RT, and those use the Canon RT system, not the Yongnuo 622 system, so you'd have to go with a YN-E3-RT or other Canon RT master unit instead of the YN-622C-TX; or consider getting a wireless eTTL master unit and use the built-in optical slave in the 430EXII, but you'll have all the range, reliability, and line-of-sight issues of an optical system.

Alternatively, you could purchase a YN-685 flash, which has a YN-622C receiver built-in, instead of using a 430EXII. It's more expensive, and a big unit (larger than a 580EXII), but more convenient, since you don't have to pack the trigger and its batteries--just the flash.

But getting a $40 YN-622C transceiver is probably the cheapest route.

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No. The Yongnuo YN622C-TX is a radio transmitter. The built in receiver in the 430EX II is an optical receiver. The two are not compatible without a radio receiver YN622C on the 430EX II. The YN622C runs about $35-40.

Your other budget option is to use a 90EX as a master flash to control the 430EX II. They go for around $45 on eBay. But the small size and guide number of the 90EX means the range will be somewhat limited, especially outside in bright light. The 90EX is marketed as a compact flash for the EOS M series of cameras, but it will control any slave flash compatible with the Canon E-TTL wireless optical system. This includes HSS functionality.

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You will need to have a YN622C tranciever attached to the 430EX II.

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