Pentax K-5 Operating Manual page 7

You can set the functions for when the RAW/Fx button, AF button or
Preview dial is operated, or when the shutter release button is pressed
halfway.
For each exposure mode, you can set the functions for when the front and
rear e-dials or ® button are operated.
1
2
3
4
Select [E-Dial Programming] in the [1_ Rec. Mode 5] menu
and press the four-way controller ( • ).
The [E-Dial Programming 1] screen appears.
Use the four-way controller
(A T) to select an exposure
mode.
Turn the rear e-dial ('-,,'_,,:) to display the
[E-Dial Programming 2] screen.
SV-'_'-"" ",,,_,,,ISO @- -
TV:_:Tv ",_,- - @- -
TAv."_'_Tv "_Av @P LINE
Press the four-way controller ( • ).
The screen for the selected exposure mode appears.
Press the four-way controller ( • )
and use the four-way controller
(A T) to select a function.
You can perform the following settings for
each exposure mode.