P.120, Use the 4 button to focus on the subject – Pentax L User Manual
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You can set so that the focusing performed when the shutter release
button is pressed halfway is canceled 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] 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
Spot AF
Enable AF
Cancel AF
AF with shutter release
button disabled so AF
performed with OK button