Field Guide: FJ Wireless Flash & Sony a9 III Compatibility Settings

This guide is your key to achieving maximum compatibility between the Sony a9 III and the FJ Wireless Flash System. By customizing specific settings on both your camera and flashes, you'll achieve optimal performance to bring your creative vision to life. We will update this guide with additional settings and new findings as they’re available to ensure your gear performs at its best.

Sony a9 III Settings

  • Manual Mode
    • Set to Manual Mode for achieving flash sync speeds up to 1/80000
  • Auto Focus
    • Adjust to AF-S for flash sync speeds up to 1/80000
  • Silent Shutter
    • Shooting Menu-> Silent Mode Settings-> Off
  • Flash Mode
    • Exposure/Color Menu -> Flash Mode -> Fill Flash
  • Wireless Flash
    • Exposure/Color Menu-> Wireless Flash -> Off
  • Red Eye Reduction
    • Exposure/Color Menu -> Red Eye Reduction -> Off
  • Sync Terminal Setting
    • Exposure/Color Menu -> Sync Terminal Settings -> Always
  • Reg. Flash Shooting Set
    • Exposure/Color Menu -> Reg. Flash Shooting Set -> Shutter Speed Range 1/60-1/80000
  • Flash Timing Setting
    • Exposure/Color Menu -> Flash Timing Setting -> On->
    • Change the µs to the appropriate number that’s determined by your shutter speed and the power of your flash

FJ Wireless Settings

  • Currently, all FJ Wireless equipment must be in Manual Mode to achieve flash sync speeds of up to 1/80000
  • TTL Mode is currently unavailable when trying to achieve a shutter speed past 1/8000
  • FJ-X triggers should be set in Front Curtain shutter and not HSS. (HSS will not allow you to go past a shutter speed of 1/8000.)

 

FJ400 Flash Sync Settings

FJ400 @ 1 Meter

Shutter Speed 500 1000 2000 4000 8000 10000 20000 40000 80000
Flash Power Flash Sync Setting
9 0 300 560 600 660 760 680 640 660
8 0 580 700 760 800 940 780 960 980
7 0 160 580 680 820 760 820 960 900
6 0 0 480 620 720 660 780 800 800
5 0 120 460 520 680 700 660 720 740
4 0 0 360 500 560 620 680 660 680
3 0 0 380 440 540 540 560 620 620
2 0 40 320 400 500 520 620 620 580
1 0 0 220 420 450 420 440 460 480

 

We will provide Flash Sync settings for other FJ Wireless flashes in the future.

Updated: 2/21/2024

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