Pentax ZX-5 Operating Manual page 79

This camera automatically reads the film speed from
the film's DX code. However, the film speed setting can
be changed. If you use a non-DX coding film, set the
film speed manually.
How to set
1. While holding down the exposure compensanon dial
lock button, set the exposure compensation dial to
[ ISO ] .
2. To change the ISO to a larger number (higher film
speed), hold down the AF Spot button until the de¬
sired ISO is indicated on the LCD panel.
3. To change the film speed to a smaller number (lower
film speed), hold down the Spot AF button while
holding down the exposure compensation lock but¬
ton.
4. After the ISO is set move the exposure compensa¬
tion dial to [ 0 ].
* When exposure compensation dial is set to [ ISO ],
[ A ] is displayed on the LCD panel to indicate that
the ISO can be changed to a large number. When the
exposure compensation dial lock button is depressed,
[ ▼ ] appears on the LCD panel to indicates that the
ISO can be changed to a smaller number.
• The shutter cannot be released with the exposure
compensation dial set at [ISO].