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The camera focus can be made either directly on the camera or through Xangle. In some cases, it is easier / more accurate to do it on the camera. Either way, you’ll need to have your calibration bar in place as it is going to be your focus point (see instructions below). Make sure the lenses are in focus before you perform the digital calibration. Out of focus lenses are going to make the markers look bigger, resulting in poor calibration.