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Shortest distance from frontmost surface of the lens that can be brought into sharp focus.
If the lens is fixed-focus, this will be 0.
Units: See CameraCharacteristics.LensInfoFocusDistanceCalibration for details
Range of valid values:
>= 0
Optional - This value may be null on some devices.
Limited capability - Present on all camera devices that report being at least CameraMetadata.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED devices in the CameraCharacteristics.InfoSupportedHardwareLevel key