What the viewfinder indicators mean on a PowerShot SD1100 IS.
The indicators light or blink when the <ON/OFF> button or the shutter button is pressed.
Upper Indicator
Green: Ready to shoot (camera beeps twice)/ Ready to communicate (during a computer connection)
Blinking Green: Time Lapse (movie) recording/Image recording/ reading/erasing/transferring (when connected to a computer/printer)
Orange: Ready to shoot (flash on)
Blinking Orange: Ready to shoot (camera shake warning)
Lower Indicator
Yellow: Macro mode /infinity mode/AF lock mode
Flashing Yellow: Focusing difficulty (beeps once)