The visualizers or document cameras have to a large extent replaced the Over Head Projectors and are wired into the VAVS switching controls for ease of use. They can be used to show documents, handwritten notes, book pages, objects of interest and much more. Your imagination is the limit!
To turn the visualizer on, slide the switch marked On/Off in a direction away from you. For optimum contrast, light etc., the lights and camera positions can be changed manually by moving the individual arm and head.
Adjust iris aperture, zoom and focus to suit by pressing the labelled oval blue buttons on the front of the visualizer.