Pentax K-r Operating Manual page 217

Available operations
E-dial
| button
mc button
M button
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Press the 4 button.
The camera returns to the control panel.
You can also change the settings from the [A Rec. Mode 1] menu (p.87).
Switches between [Sharpness] and [Fine Sharpness].
When set to [Fine Sharpness], image outlines can be
captured with more detail.
Resets the set value. (Available only when [Green
Button] is assigned to the | button in [Green Button] of
the [A Rec. Mode 4] menu (p.197).)
Uses Digital Preview to preview the background image
with the setting applied.
Saves the background image. Select [Save as] and
press the 4 button. (Not available during Live View.)
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