Pentax K-5 Operating Manual page 109

Program Line
In [Program Line] of the [a Rec. Mode 3] menu, you can choose from
the following Program Lines. When [P LINE] is selected for the ®
button setting in P/Sv mode or TAv/M mode (p.282), exposure is
regulated according to the set Program Line.
setting characteristics
Auto Camera determines the appropriate settings.
Basic Program Automatic Exposure (default
Normal
setting)
Program Automatic Exposure that prioritizes high
[:_ Hi-speed Priority shutter speeds.
DOF Priority Program Automatic Exposure that closes the
(deep) aperture as much as possible for a deep depth of
field.
DOF Priority Program Automatic Exposure that opens the
aperture as much as possible for a shallow depth
(shallow) of field.
Program Automatic Exposure that prioritizes the
MTF Priority best aperture settings for the attached lens when
a DA, DA L, D FA, FA J or FA lens is used.
Using a Lens with an Aperture Ring
When using a lens with an aperture
ring, set the aperture to the A (AUTO)
position while holding down the auto-
lock button on the lens.