Godox flash setup

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SunsetBk Regular Member • Posts: 446
Godox flash setup

I am having great difficulty setting up the flashes. I typically use natural light but I am trying to take studio style photos. My setup is a7riii with 2 godox TT 685S flashes facing umbrellas off camera, with XT1 triggering them via TTL (radio mode).  I have setup zoom to auto.  I am trying to keep background in focus F5.6-8 and keep a fast shutter around 1/1000 (kids).  On camera in TTL this works fine.   Both flashes fire off camera, but the images are strongly underexposed.

I've read everything I can online including the post below but still cant figure this out

https://www.dpreview.com/forums/thread/4366397

 SunsetBk's gear list:SunsetBk's gear list
Sony a7R III Voigtlander 15mm F4.5 Super Wide Heliar Sony FE 55mm F1.8 Sony FE 24-105mm F4 Samyang AF 35mm F1.4 FE +2 more
Fujifilm X-T1
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