Focusing a camera is a simple task, but most camera operators don't know how to correctly achieve good focus in images. "Critical focus" is a technique we use in broadcast to get accurate focus fast. We took a few minutes to have Trevor, our shop manager, help us demonstrate this for the camera.
He may look in focus from a quick glance on the screen when he is at a distance, but when we zoom in we can see he is not. Whenever you may be focusing a camera you need to consider that the distance will change between you and the subject you need to focus on. This includes changing camera locations, or when someone moves back and forth across a stage. Zooming will not change focus because, but It can reveal focus issues.
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