Using The Center-Weighted Metering; Using The Spot Metering - Pentax *istD Operating Manual

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Using the Center-Weighted Metering

Metering is weighted at the center of the screen. Use this metering when
you want to compensate the exposure by experience, instead of leaving it
to the camera.
The illustration shows that sensitivity
increases as the pattern height increases
(center). This mode does not automatically
compensate for backlit scenes.
1
4
Rotate the metering mode
select lever to set the white
index to M.

Using the Spot Metering

With spot metering, brightness is measured
only within a limited area at the center of the
screen as shown in the illustration. You can
use AE lock in combination when the
subject is extremely small and proper
exposure is difficult to obtain. (p.69)
1
Rotate the metering mode
select lever to set the white
index to 6.
Spot metering zone