Pentax *istDL2, Руководство по эксплуатации

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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