What does the little yellow box do??

[Scott J. Breier]

Could someone explain what the function is for the little yellow box that shows up when I tap the screen for my FPV??

 

[jlo]

It's exposure lock. (Spot, as pointed out below is more accurate )

 

[cnynctry]

Spot exposure vs. the average for the entire scene.

 

[Scott J. Breier]

Thank you!