Pentax K 100D Super Operating Manual page 128

126
Using the 4 Button to Focus on the Subject
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.106)
OK btn when shooting
Confirm Sensitivity
Center of AF Point
Enable AF
Cancel AF
AF with shutter release
button disabled so AF
performed with OK button
5
Only use this function with lenses that are compatible with Quick Shift Focus
(lenses with "DA" or "D FA").
• When [Confirm Sensitivity] is selected, press the 4 button to display the
currently selected sensitivity in the viewfinder. When [Sensitivity] is set to
[AUTO] in the Fn menu, the automatically selected value is displayed.
• When [Center of AF Point] is selected, the AF point can be set to the center by
pressing the 4 button (Only when [Swtch dst msr pt] is set to S (Select)).
• 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).