Wrong flash power delivered, but right value displayed

I've bought 3 Cactus v6 II to control 2 Canon Speedlight 430 EX flashes.
When I press the test button from the transmitter, the flashes deliver the power I remotely ask. I did a simple test with 1/128.
But when I press the camera shutter, the flashes deliver full power, so 1.
When I take a look to the power desired, the transmitter and the receivers all display 1/128.
What am I doing wrong?


  • Hello,

    Can you check the the "Sync Mode" in the V6 II menu under "Functions", if the option is set to "Power Sync", the flash will always fire at full power.

    By the way, can you let me know the firmware version in V6 II that you are using?

    All the best,
    Ray Chan

    Senior Product Specialist
    Harvest One Limited
  • Thank you for your answer. The "Sync Mode" is on "Normal HSS", not "Power Sync".
    However, when searching in the transmitter settings, I changed to the flash profile from "canon auto" to the specific "Canon 430 EX*" and not it works.
  • Can you provide the firmware version that is loaded in the V6 II units?

    Using different firmware version may cause the inaccurate power level problem.

    Best regards,
    Ray Chan

    Senior Product Specialist
    Harvest One Limited
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