Press The Shutter Release Button Halfway - Pentax OPTIO S4I Operating Manual

If you take a picture while looking through the viewfinder when the
focus mode is set to Macro or Super Macro, the range of the
resulting picture will differ from what was seen in the viewfinder. Be
sure to check the image on the LCD monitor.
Manual Focus
When the mode is set to z (Manual Focus), the central portion of the
picture is enlarged to full screen on the LCD monitor for focus
adjustment. Use the four-way controller (23) to adjust the focus while
watching the indicator on the LCD monitor.
For distant focus
4
For closer focus
After the focus is set, press any button except the four-way controller
( ) or take your finger off the four-way controller (
23
returns to the normal display about two seconds later.
When focusing, hold down the four-way controller (23) to focus
quickly.
Changing the Focusing Point
In Autofocus mode, you can change the focusing point by moving the
focus frame.
1
u
In
controller (2345).
Moves the focus frame [ ] (Focusing area).
2

Press the shutter release button halfway.

The focus frame is fixed in its new position.
To return the focus frame to its original location, press the qsz
button again.
70
(Focusing Area) mode, press the four-way
Troubleshooting "Subject is not in focus" 1p.131
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Indicator
). The screen
23
2 2