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The lens focus distance calibration quality.
The lens focus distance calibration quality determines the reliability of focus related metadata entries, i.e. CaptureRequest.LensFocusDistance, CaptureResult.LensFocusRange, CameraCharacteristics.LensInfoHyperfocalDistance, and CameraCharacteristics.LensInfoMinimumFocusDistance.
APPROXIMATE and CALIBRATED devices report the focus metadata in units of diopters (1/meter), so 0.0f represents focusing at infinity, and increasing positive numbers represent focusing closer and closer to the camera device. The focus distance control also uses diopters on these devices.
UNCALIBRATED devices do not use units that are directly comparable to any real physical measurement, but 0.0f still represents farthest focus, and CameraCharacteristics.LensInfoMinimumFocusDistance represents the nearest focus the device can achieve.
Possible values:
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