Pentax Optio A20 - Manual (Page 58)

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R (Program mode), (Shutter Priority mode) and (Manual Exposure
mode) allow you to take pictures with various aperture and shutter speed settings
(Exposure modes).
Enjoy a wide variety of shots by using other functions such as Flash mode or
Continuous Shooting mode.
Effect of Aperture and Shutter Speed
There are many correct combinations of shutter speed and aperture for a
particular subject. Different combinations produce different effects on a picture.
Using the Exposure Mode and Other Fuctions
R Program
Sets shutter speed and aperture automatically for proper
exposure.
Shutter Priority Set shutter speed manually. Aperture is set automatically.
Manual
Exposure
Set both shutter speed and aperture manually.
Slower shutter
speed
The shutter remains open for a longer time. If the subject is moving,
the image will be blurred while the shutter is open, thus enhancing
the effect of motion.
Faster shutter
speed The shutter remains open for a shorter time. It allows freezing the
action of a moving subject.
Lesser aperture
value
Decreases the amount of light which enters through the lens.
Higher aperture
value
Increases the amount of light which enters through the lens.
Shutter release button
Four-way controller
OK button