HTC HD2 User Manual page 239

Flash Mode Function
When there is not enough environmental light, the camera flash
turns on automatically when you take a photo, while the assist
light turns on automatically when you capture a video and
remains on until you stop capturing.
The assist light turns on every time the camera focuses. The
camera flash then turns on when you take a photo, while the
assist light turns on when you capture a video and remains on
until you stop capturing.
The flash light is always off.
Important
Do not point the flash light near to or directly into people's eyes to
avoid potential damage to their eyesight.
Camera flash light doesn't turn on?
Using the flash light eats up much battery power. To save battery
power, the camera disables the flash light (even when you have set
it to "auto" or "always on") when one of the following occurs:
• You have an incoming call.
If you have set the flash light to "always on", it turns back on
after you answer and end the call.
• Your phone's battery level reaches 20% or lower.
Recharge the battery so that the camera can have enough
battery power to use the flash light.
• Cold weather may lower battery performance which affects
the flash light.
To make sure the camera has enough battery life to power
up the flash light, keep your phone warm. When not in use,
put the phone inside your jacket to keep it warm, and try to
avoid sudden temperature changes that may affect battery
performance.
Chapter 12 Camera and Multimedia 2