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camera fov

I found the FOV of the camera is quite small when I call Renderer.getInstance().drawVideoBackground() to render the background on 1080*1920 screen,  compared with the built in camera of my android device. For example, an object is larger seen from the Vuforia drawBackground() than the device's camera.

I searched the document but in vain.   So how can I customize the FOV? Or is there other ways to get more image information from the camera?