VIVOTEK
User's Manual - 55
Focus
Focus here refers to the
Remote Back Focus
, is applicable to Network Cameras that are
equipped with stepping motor lens� The automated focus adjustment function eliminates
the needs to physically adjust camera focus� In an outdoor deployment consisting of a
large number of cameras, the auto focus function can be very helpful when these cameras
become out of focus after days or weeks of operation� And that can easily result from
the effects of natural forces, e�g�, shrink and expand due to a wide range of operating
temperatures and the vibration caused by wind�
Below is the procedure to perform the automated Focus function:
1� Select from the bottom of the screen whether you want to perform focus adjustment on
the
Full view
or within a
Custom
focus window� You can create a custom window and
click and drag the window to a desired position on screen�
2� It is recommended to
Reset
to the default back focus position of the sensor board�
3� You can use the
Open iris
button to
increase the iris size for a better focus adjustment
result�
4. On an initial setup, you can change the zoom factor and roughly make focus using hte
pullers on the lens module�
5� Click to select the
Fine-tune focus
or the
Full-range scan focus
buttons� When a full-
range scan is selected, a full-range scan through the camera's entire focal length can
take about 30 to 80 seconds� If not, the auto focus scan will only go through the length
where optimal focus may occur, and that takes about 15 to 20 seconds� In theory, best
results of the auto scan can be acquired when the camera's iris is fully open�
Focus window
x
