Pentax Optio M50 Operating Manual page 52

To Save the Setting and Start Taking Pictures
6
Press the shutter release button halfway.
The setting is saved and the camera returns to capture status.
When the shutter release button is pressed fully, the picture is taken.
When the [W Setting] menu is displayed from Q mode, you can
switch to A mode by pressing the Q button.
To Save the Setting and Begin Playback of Images
3
6
Press the Q button.
When the [A Rec.Mode] menu is displayed from A mode, the setting
is saved and the camera returns to playback status.
To Save the Setting and Continue with Menu Operations
6
Press the 4 button or the four-way controller (4).
The setting is saved and the screen returns to Step 3.
To Cancel the Changes and Continue with Menu Operations
6
Press the 3 button.
The changes are canceled and the screen returns to Step 3.
The 3 button function differs depending on the screen. Refer to
the guide indications.
MENU
MENU
MENU
50
Exit : Exits the menu and returns to the original screen.
: Returns to the previous screen with the current
setting.
Cancel : Cancels the current selection, exits the menu and
returns to the previous screen.