camera: Red Box keeps appearing at the center of the screen

[Moltres_rider]

quite frequently I get a red box appearing at the center of the screen while using the camera. it is only there for maybe 10 seconds then disappears then comes back 10 seconds later, repeat, repeat, repeat, until I take the picture. what does this red box mean??? I googled "android camera red box" & "android camera red box on screen" but ONLY stuff about the company called Red Box came up

 

[rbarnes65]

It means that it is out of focus I believe. When the box is green that means it is in focus.

Galaxy S4