Flash Sync Speed Awareness
The app knows your body's max sync speed and reminds you.
Where to find it
Flash exposure dialog Advisory row; MultiFlashDialog
Summary
The maxFlashSyncSec is parsed from cameras.json and stored in CameraSpec (e.g. Nikon F3 = 1/80s). The FlashSyncAdvisoryRow composable is shown at the top of FlashDialog and MultiFlashDialog to warn when a shutter speed exceeds safe sync.
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How it works
Your camera body has a maximum shutter speed at which the flash will fire safely. The F3 syncs at 1/200. Some older cameras only sync at 1/125. If you try to fire a flash at a speed faster than your body can handle, the flash may not light the whole frame.
The advisory
When you open the Flash dialog and your current shutter speed is faster than your body's sync limit, a warning row appears at the top. It shows the safe limit and the current speed, so you can adjust before you shoot.
Multi-flash
If you're using multiple flash units, the same advisory applies. The warning covers all of them at once.
What to do
Slow the shutter down to the body's limit, use ND to compensate if needed, or switch to ambient-only metering.