Edimax Technology IC-3115W - Manual (Page 93)

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9.7 Zoom-In/Zoom-Out
For cameras that support the zoom-in / zoom-out function, you can use this
function to see more objects within the camera’s view, or enlarge the image size
of a certain object to see it in detail.
Please select a camera in the video display area by clicking on its image, then
click the
button to see more objects within the camera’s view, or click
to enlarge the image size of a certain object to see it in more detail (before
zooming in, you may need to use the PTZ buttons - described in the next section
- to find the object you wish to see in detail).