Pentax Optio A20 - Manual (Page 94)

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Sensitivity (ISO sensitivity) is a value indicating how much the CCD senses light.
Low value equals low sensitivity, and high value equals high sensitivity.
Sensitivity can be adjusted according to the shooting situations.
Sensitivity
1
Press the MENU button in Capture mode.
The [A Rec.Mode] menu appears.
2
Use the four-way controller (23)
to select [Sensitivity].
Setting the Sensitivity
AUTO
The camera automatically selects the sensitivity from 64, 100, 200, 400
and 800. (In Blur reduction mode, 1600 is also selectable.)
You can also set ISO Correction in AUTO to 64 - 100, 64 - 200, 64 - 400,
or 64 - 800. (In Blur reduction mode, 64 - 1600 is also selectable.)
64
At lower sensitivity, images are sharper and noise is reduced, but the
shutter speed will be slower under dark conditions.
At higher sensitivity, the shutter speed can be fastened under dark
conditions, but noise will increase.
(In Blur reduction mode, 1600 is also selectable.)
100
200
400
800
Rec. Mode
MENU Exit
Recorded Pixels
Quality Level
White Balance
AF Setting
AE Metering
Sensitivity
AWB
10 M
AUTO 800
MENU
Shutter release
button
MENU button
Four-way
controller
AUTO 800
Rec. Mode
MENU Exit
Recorded Pixels
Quality Level
White Balance
AF Setting
AE Metering
Sensitivity
AWB
10 M