Pentax DS2 - Manual (Page 107)

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4
Me
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c
e
Item Function Page
e (Program)
Automatically sets shutter speed and aperture
to the proper exposure when taking pictures.
p.134
b
(Shutter Priority)
Lets you set the desired shutter speed for
expressing the motion of moving subjects.
Take pictures of fast moving subjects that look
still or subjects that give a sense of movement.
p.135
c
(Aperture Priority)
Lets you set the desired aperture for controlling
the depth of field. Use to blur or focus on the
background.
p.137
a (Manual)
Lets you create the picture you have in mind by
combining set shutter speed and aperture.
p.139
p (Bulb)
Lets you capture images that require slow
shutter speeds such as fireworks and night
scenes.
p.141