Pentax ZX-5N - Manual (Page 53)

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 71.
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
unsuited 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 ^/4, Shift 28mm f/3.5 (shifted),
or Reflex lens are in use.
d) An old type screw-mount lens fitted with an optional
"Mount Adapter K".
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