Lock focus and exposure
When the camera is active, tapping the screen sets the focus and exposure for that object. But, the moment the camera moves, these settings are lost.
To lock the focus and exposure, tap and hold until you see a yellow bar appear at the top of the screen, Even if you change your composition, the focus and exposure will be unaffected.
Lock Rotate
This may not qualify as much of a secret, since Apple promotes the feature, but in my early
experience, it's terrifically useful. Flick the switch above the volume controls to lock screen
rotation. The iPad is quite sensitive to orientation, and rotates its screen with little provocation.
Locking rotation means sticking with the view you're in, even as you shift position, or place the
iPad flat on a surface.
