Canon PowerShot SX420 IS Black Manual

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 Contents
Focus.
 
The focus and exposure are 
maintained where the blue AF 
frame is displayed while you 
are pressing the shutter button 
halfway.
 
Focusing may not be possible in some shooting conditions.
 
In low-light conditions, Servo AF may not be activated (AF frames 
may not turn blue) when you press the shutter button halfway. 
In this case, the focus and exposure are set according to the 
specified AF frame mode.
 
If adequate exposure cannot be obtained, the shutter speed 
and aperture value are displayed in orange. Release the shutter 
button, and then press it halfway again.
 
[AF-Point Zoom] on the [
 
Not available when using the self-timer (= 76).