Olympus 3TI, Instructions Manual

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SPOT METERING (1)
This spot metering system measures the brightness of
the central spot of the picture frame (2% of the entire
frame).
The center-weighted average light metering provides
correct exposure for subjects in follow light and in
pictures having a nearly uniform brightness throughout
the entire frame. Exposure compensation is necessary,
however, for backlit subjects and in compositions using
special lighting in which there is a difference in brightness
between the subject and background. In some cases, it
would also be desirable to express subtle lighting effects
according to the photographer's subject motive. To
realize such sophisticated expressions, fine metering of
various spots on the subject is required. If the "Spot"
button of the OM-3Ti is pressed, the metering mode
switches to spot metering in which the brightness of the
area (corresponding to the microprism section in the
center of the viewfinder) is metered and stored in
memory. By using this spot metering, photographers can
control exposure as desired to realize creative
lighting compositions.
Spot metering 3-dimensional
sensitivity distribution diagram
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