Canon EOS 66 - Metering Modes

The camera has three metering modes: Evaluative, partial, and
centerweighted averaging metering. Evaluative metering is the standard
metering mode. Partial metering Is set automatically when AE lock is used
(-^page 51), and centerweighted averaging metering is set automatically in
the <M> mode (->page 48).
Evaluative metering
This is suited for most shooting
situations including backlit conditions.
The subject’s position and brightness,
the background, the existing light,
backlight conditions, and the active AF
frames are taken into account to obtain
a suitable exposure.
Partial metering
The exposure setting is based on the
brightness of an area 9.5% of the
viewfinder screen at the center. It is
effective for backlit subjects.
• The partial metering area (shaded) is
approximated by the diagram on the
left.
Centerweighted averaging
metering
The metering is weighted at the center
and then averaged for the entire
scene.
In the One-Shot AF and Al Focus AF (except Al Servo AF) modes (^page 70),
when you press the shutter button halfway and focus is achieved, the exposure
is locked automatically at the same time.
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