Sony DSLR-A100 - Manual (Page 59)

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(Spot) This mode measures light only in the spot metering circle in
the center of the frame. This is suitable for shooting a subject
with strong contrast or measuring the light of a specific area
of the screen. If the area to be measured is not in the center of
the screen, use AE lock to take the picture (page 67).
z Multi-segment metering (40-segment honeycomb pattern metering)
This camera divides the screen into 40 segments to measure light; 39
honeycomb shaped metering elements and one metering element that covers
the surrounding area. These elements work in sync with autofocus, allowing
the camera to accurately measure the position and brightness of the subject no
matter where it is on the screen in order to determine the exposure. This
metering method enables the camera to measure light in a way most similar to
that of the human eye, which is ideal for general shooting, including shooting
into direct sunlight.
• In multi-segment metering (40-segment honeycomb pattern metering), if the focus is locked by
pressing and holding the shutter button halfway down, the exposure (the shutter speed and the aperture)
is locked simultaneously (only when autofocus is used and the AF mode is set to either
(Single-
shot AF) or (Automatic AF)).
Spot metering area
Position of the subject.