Pentax ist - Manual (Page 54)

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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 coded film, set the film speed manually.
How to set
1
Load the non-DX coded film.
Set the mode dial to
.
2
Turn the select dial to set
the ISO film speed.
3
After setting the ISO speed, set the mode dial to the
desired mode position other than
, and
.
✍
MEMO
• The shutter cannot be released when the mode dial is set to ,
or .
• is displayed when you set a film speed other than the DX coded
film speed.
SETTING THE FILM SPEED (ISO)
MANUALLY