Edimax Technology IC-3005Wn - Manual (Page 92)

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3-7 Zoom-in / Zoom-out
For cameras that support zoom-in / zoom-out function, you can use this
function to see more objects that fall in the scope of camera‟s view, or enlarge
the image size of a certain object to see its detail.
Please select a camera in video displaying area by clicking on its image, then
click
button to see more objects that fall in the scope of camera‟s view, or
click to enlarge the image size of a certain object to see its detail (Before
zoom-in, you may need to use PTZ buttons - described in next section) to find
an object you wish to see its detail).