Focusing - Pentax K-7 Operating Manual

Linking AE to AF Point during Multi-Segment
Metering
In [6. Link AE to AF Point] of the [C Custom Setting 1] menu (p.85),
you can link the exposure and AF point in the focusing area during
multi-segment metering.
1 Off Exposure is set separately from AF point. (default setting)
2 On Exposure is set in accordance with AF point.
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.
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 this in combination with the AE lock
(p. 116) when the subject is extremely small
and the proper exposure is difficult to obtain.
Setting the Meter Operating Time
You can set the exposure metering time to [10sec.] (default setting),
[3sec.] or [30sec.] in [4. Meter Operating Time] in the [C Custom
Setting 1] menu (p.85).