Pentax Optio E90 ユーザーズマニュアル

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Understanding the Button Functions
1
Power switch
Turns the camera on and off (p.35).
2
Shutter release button
Focuses the camera on the subject when pressed halfway in Still 
Picture Capture Mode (except in 3 and s modes).
Takes the still picture when pressed down fully (p.57).
Starts and stops movie recording in C (Movie) mode (p.93).
3
Zoom button
Changes the captured area (p.67).
4
Q
 button
Switches to the Q mode (p.48).
5
I
 button
Switches the Face Detection function (p.61). The Face Detection function 
is switched as follows each time the I button is pressed: 
Smile Capture ´ Face Detection Off ´ Face Detection On
A
 Mode
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