ASAHI PENTAX Z-70 Operating Manual page 53

When the lens aperture ring set at other than the if
Set the main switch to [ON] or [PICT].
With the lens aperture ring set at other than the A posi-
tion, the exposure mode switches as shown at left in ac-
cordance with the rotation of the select dial while
holding down the mode set button.
Turn the lens aperture ring from [A] to a manual f-stop
setting when using the following accessories.
* Accessories such as the Extension Tube Set which do
not allow the automatic diaphragm control for expo-
sure.
* Old type flash units which do not allow the use of the
[A] position of the lens aperture ring.
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