Pentax *ist IST DS - Manual (Page 107)

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e (Program)
Shutter speed and aperture are automatically
set to the proper exposure when taking
pictures.
p.133
b
(Shutter Priority)
Set shutter speed and use to express the
motion of moving subjects. Take pictures of
fast moving subjects that look still or subjects
that look lively.
p.134
c
(Aperture Priority)
Set aperture and use when you want to adjust
the depth of view. Use to blur or focus on the
background.
p.136
a (Manual)
Combine set shutter speed and aperture to
create the picture you have in mind.
p.138
p (Bulb)
Use to capture images that require slow
shutter speeds such as fireworks and night
scenes.
p.140
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