Pentax K-X - Manual (Page 108)

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Metering is weighted at the center of the
viewfinder. 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.
With spot metering, brightness is measured
only within a limited area at the center of the
viewfinder as shown in the illustration. You
can use this in combination with the AE lock
(p.108) when the subject is extremely small
and the correct exposure is difficult to obtain.
Using the Center-Weighted Metering
Using the Spot Metering
Linking AE to AF Point during Multi-segment
Metering
In [6. Link AE to AF Point] of the [A Custom Setting 1] menu (p.81),
you can link the exposure and AF point in the focusing area during
multi-segment metering.
1 Off Exposure is set separately from the AF point. (default setting)
2 On Exposure is set in accordance with the AF point.
Setting the Meter Operating Time
You can set the exposure metering time to [10 sec.] (default setting),
[3 sec.] or [30 sec.] in [4. Meter Operating Time] of the [A Custom
Setting 1] menu (p.81).