Samsung SDP-850 Manual page 3

Power
To turn on the power, press the main POWER button as indicated in the
diagram on the left. (The red light on the front of the base of the camera
indicates that the unit is off . The red light disappears once the unit is
powered on.)
AWC
After the document camera is turned on, it will perform an automatic-
white balance / color (AWC) adjustment.
For best results and most accurate color, place a white piece of paper under the lens when you turn the unit
on. Printed text on white paper is also OK. You can re-adjust the color at any time by pressing the AWC
button.
INT/EXT
Auto-focus (AF)
Pressing the INT/EXT
button allows the
document camera to
switch between
projecting what is under
the document camera
(INTERNAL) and what
is on your computer
screen (EXTERNAL).
Although you can press
the FOCUS + and –
buttons to focus
manually, pressing the
AF button once will
focus for you
automatically.