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Re - parameters: which parameters do you want to get? If you are referring to the warning about MONO8: http://wiki.ros.org/dynamic_reconfigure

Re - calibration: http://wiki.ros.org/camera_calibration

Re - multiple uEye cameras: if you want them to operate independently, then yes you need to duplicate the launch file, and change the node name, camera namespace, and camera ID. If you want to synchronize the exposure of both cameras, see: http://wiki.ros.org/ueye_cam#Camera_Synchronization