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P.122, Use the 4 button to focus on the subject – Pentax * istDL2 User Manual

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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 [Enable AF] in [OK btn when shooting] in the [A Custom Setting]
menu. (p.102)

Use the 4 Button to Focus on the Subject

Only use this function with lenses that are compatible with Quick Shift Focus.

• Select [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 the 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
Spot AF
Enable AF
Cancel AF

AF with shutter release
button disabled so AF
performed with OK button