Visual Presenter (Document Camera) 1/4" Color Super HAD-CCD, 800,000 Pixel, 22x optical and 8x digital zoom lens, RS232 & USB. Visual Presenter (Document Camera)1/4" Color Super HAD-CCD, 800,000 Pixel, 22x optical and 8x digital Focus Adjustment, Control mode: Keyboard, RC, RS232 & USB. Visual Presenter (Document Camera)