Pentax ZX-5 Operating Manual page 52

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• When the subject comes into focus, the focus indica¬
tor [O] lights up in the viewfinder and an audible PCV
signal is heard. The audible PCV signal can be can¬
celed. See page 70.
• If an old type screw-mount lens is used with an op¬
tional Mount Adapter K, the in-focus indicator in the
viewfinder cannot be used.
When the autofocus mode or the in-focus indicator is
unsuitable for focusing
When the autofocus function or the viewfinder's in¬
focus indicator [O] cannot be used for focus confirma¬
tion for the following reasons, focus on the subject in
the manual focus mode with the aid of the matte field in
the viewfinder as you would with a non-AF SLR camera.
a) The in-focus indicator [O] blinks because the sub¬
ject is difficult to autofocus.
b) The maximum aperture of the lens in use is smaller
than f/5.6.
c) A bellows 100mm i/A, Shift 20mm f/3.5 (shifted),
or Reflex lens is In use.
d) An old type screw-mount lens fitted with an optional
"Mount Adapter K".

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