Pentax ist - Manual (Page 68)

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SELECTING THE PICTURE MODES
The camera incorporates the Auto picture mode function.
In this mode, the camera automatically selects one of the five
picture modes depending on the camera-to-subject distance and
image magnification. You can also select your desired picture
mode manually. The picture mode has a total of 6 modes as
follows. See page 68 to 73 for details of each mode.
Auto picture mode
(The proper exposure is automatically selected.)
41
Standard Program Mode 68
Portrait Program Mode 69
Landscape Program Mode 70
Close-up Program Mode 71
Action Program Mode 72
Night-Scene Program Mode 73