HP R717 - Manual (Page 45)

45 Taking Pictures and Recording Video Clips
Optical Zoom
Optical zoom works like the zoom on a traditional film
camera, where physical lens elements move inside the
camera to make the subject of your picture appear closer.
Press Zoom Out
and Zoom In on
the Zoom lever to move the lens between
wide angle (1x) and telephoto (3x)
positions.
NOTE: Optical zoom is not available
when recording video clips.
Digital Zoom
Unlike optical zoom, digital zoom uses no moving lens parts.
You can use digital zoom when you have exhausted optical
zoom and you want to capture only a portion of the scene in
the Image Display. As you zoom in, a yellow frame
surrounds the portion of the scene you want to capture,
allowing you to eliminate unwanted portions of the scene.
1. While in Live View, press Zoom In on the Zoom lever to
optically zoom in to the maximum level, then release the
lever.
2. Press Zoom In again and
continue to press it until the
image you want to capture fills
the yellow frame. If you zoom in
too far and want to zoom out,
press Zoom Out on the
Zoom lever.