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What is Pass Through and How Would I Use It
Pass Through (also referred to as “Loop Through”) is a field monitor feature that duplicates an input signal and sends it out of an additional output. 
 
An on-camera monitor with HDMI Pass Through would have both an HDMI input and an HDMI output. When you connect an HDMI cable from a camera to the HDMI input on the monitor, the Pass Through functionality duplicates the video signal from the camera and sends it to the HDMI output on the monitor. 
 
This enables you to connect the video feed from the camera to an additional field monitor, or to another piece of equipment. Without Pass Through, you need to purchase active signal splitters (which require power to operate).
What is Pass Through and How Would I Use It