On the preview interface, right click mouse and then select PTZ; you can
see an interface shown as below.
Click Iris “+” to open menu or confirm current operation. Click up/down
button to view all the items on the left pane of the following list. Click left/
right button to set the corresponding values on the right pane of the follow-
ing list. If there is , click confirm button to go to the 2nd menu. Repeat
the previous steps to set detailed value. Click return button to go back to
the previous menu interface.