HTC Desire Z User Manual page 116

116 Camera
Zooming
Before taking a photo or video, you can first use the onscreen zoom bar to zoom in or
out of your subject.
If you choose 720p HD resolution for video recording, there's no zooming available.
Simply slide your finger across the zoom bar to zoom in or out.
When you're recording video, the zoom bar is always shown onscreen. You can freely
zoom in or out while recording.
Zoom bar
Auto focus indicator
Photo/Video mode switch
Flash button
Shutter release/Record button
Effects button
Gallery button