Wide dynamic range helps a camera retain useful detail when bright and dark regions share one frame.

Why does backlit FPV footage lose detail? Understanding WDR

A camera pointing toward bright sky may render the ground nearly black. Exposing for the ground can instead clip the sky to white. A sensor has limited dynamic range: only a finite span between the darkest and brightest levels it can record with usable detail.

What WDR does

Wide dynamic range (WDR) methods may combine exposure information, use a sensor mode with more range, or tone-map different areas of the picture. The implementation differs by camera. WDR cannot recover pixels already saturated by very bright light or details buried in noisy shadows. Strong tone mapping can flatten contrast; multi-exposure processing can create artifacts around moving objects.

Compare in the intended scene

Record the same backlit route with repeatable movement. Look for readable ground objects, highlight detail, motion artifacts and response time, not only a brighter preview. Lens flare, dirty glass and unsuitable exposure settings are separate problems. Confirm the camera's WDR mode before comparing footage.

The useful result is interpretable detail in the parts of the scene that matter to the task.