P.120, Press the 3 button in playback mode, Press the four-way controller ( 5 ) – Pentax Optio Digital Camera 750Z User Manual
Page 122: Press the q button

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You can display the image at the set magnification simply by pressing
the Zoom/f/y button toward y once during zoom playback.
1
Press the 3 button in Playback mode.
The [Q Playback] menu appears.
2
Use the four-way controller (23) to select
[Quick Zoom].
3
Press the four-way controller (5).
A pull-down menu appears.
4
Use the four-way controller (23)
to change the magnification.
Ч2, Ч4, Ч10
: Pressing the Zoom/f/y
button once toward y
takes the image straight to
the selected magnification and after that magnifies
the image in steps.
Off
: Pressing the Zoom/f/y button toward y once
magnifies the image in steps in the range of ×1.1 to
×10.0.
5
Press the Q button.
The camera is ready to play back images.
Refer to Step 6 of “How to Use the Menus” (p.43) for other operations
after the setting has been made.
Setting the Quick Zoom Function
P l a y b a c k
MENU
E x i t
S l i d e s h o w
R e s i z e
T r i m m i n g
D i g i t a l F i l t e r
Q u i c k Z o o m
Q u i c k D e l e t e
O f f
3 s e c
2, 3, 4
1
5
MENU
P l a y b a c k
O K
MENU
C a n c e l
S l i d e s h o w
R e s i z e
T r i m m i n g
D i g i t a l F i l t e r
Q u i c k Z o o m
Q u i c k D e l e t e
O f f
3 s e c
OK
x 2
x 4
x 1 0