Pentax K-R Operating Manual page 59

2
Press the four-way controller (•)
and use the four-way controller
(A T) to select [Enable AF1] or
[Enable AF2].
AF/AE=L Button
AF is performed when the
AF/AE-L button is pressed
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Autofocus is performed by using the AF/AE-L button or
Enable AF1
the shutter release button. (default setting)
Autofocus is performed only when the AF/AE-L button is
Enable AF2 _ressed and not when the shutter release button is pressed
halfway.
MF appears in the viewfinder while the AF/AE-L button is
_ressed. Autofocus is not performed when the shutter
Cancel AF
release button is pressed. (Take your finger off the AF/
AE-L button to return to normal autofocus mode.)
The exposure setting is locked when the AF/AE-L button
AE Lock
is pressed. (p.120)
Press the OK button.
Press the MENU button twice.
The camera is ready to take a picture.
Press the AF/AE-L button while
looking through the viewfinder.
Autofocus is performed.