Pentax K 100D Super Operating Manual page 113

Item
e (Program)
b (Shutter Priority)
c (Aperture Priority)
a (Manual)
p (Bulb)
Function
Automatically sets shutter speed and aperture
to the proper exposure when taking pictures.
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.
Lets you set the desired aperture for controlling
the depth of field. Use it to obtain a blurred or
sharp background.
Lets you set shutter speed and aperture to
capture the picture with creative intent.
Lets you capture images that require slow
shutter speeds such as fireworks and night
scenes.
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