Pentax DS2 - Manual (Page 122)

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You can set the camera so that the focusing is not performed when the
shutter release button is pressed halfway and is performed when the 4
button is pressed. This is useful when you wish to temporarily use
autofocus while using manual focus.
Set [3 Enable AF] in [OK btn when shooting] in the [A Custom Setting]
menu. (p.100)
Use the 4 Button to Focus on the Subject
Only use this function with lenses that are compatible with Quick Shift Focus.
• Select [4 Cancel AF]. \ appears in the viewfinder while the 4 button is
pressed. Autofocus does not activate when the shutter release button is
pressed. This is useful when you wish to temporarily use manual focus while
using autofocus.
• You can focus using the focus ring and release the shutter while 4 button
is pressed when using a lens compatible with Quick Shift Focus (take your
finger off the 4 button to immediately return to AF mode).
OK btn when shooting
Off
Center of AF Point
Enable AF
Cancel AF
AF with shutter release
button disabled so AF
performed with OK button