METERING THE AMOUNT OF LIGHT
Light Metering
Light metering can measure the brightness of the
framed picture in various ways. The IS-3DLX
employs three metering systems: (1) ESP light
metering , (2) center-weighted average light
metering, and (3) spot metering. The IS-3DLX
allows you to select the light metering system most
suitable in any photographic situation.
At the same time, the IS-3DLX uses TTL (through-
the-lens) light metering to automatically measure
the light that enters the lens. This allows you to
obtain very accurate light metering that is not
affected by changes in the distance between the
subject and the camera.
Fuzzy Logic ESP (Electro-Selective Pattern) Light
Metering (Exposure Mode P)
ESP light metering measures the brightness of the
central portion and peripheral portion of the frame
separately in order to determine the proper
exposure. The calculation program used is based
on programmed data to properly compensate for
backlighting. ESP light metering is used
automatically when in the P (Program) mode.
Center-Weighted Average Light Metering
(Exposure Mode A or M)
Center-weighted average light metering is the most
widely used light metering system (Fig. A). This
system measures the light available throughout the
frame with special emphasis on the center of the
frame. When in A (Aperture-preferred), S (Shutter -
preferred) or M (Manual) mode, this light metering
system is automatically
activated. When the
contrast between bright
and dark areas is not too
extreme outside the center
of the frame, this system
offers excellent results.
Spot Metering
Spot metering (Fig. B) measures the brightness at
the center of the frame only. Because this metering
system calculates the correct exposure for only one
point, it is convenient when the subject is backlit or
the picture contains strong contrasts. When
shooting a subject in front of an extremely bright
background, you should use spot-metering on the
subject's face. To properly expose white objects,
use spot metering and then press the + side of the
exposure compensation button. To properly expose
black objects, use spot metering and then press the
- side of the exposure compensation button.
Spot metering can be
used in any of the P, A, S
or M exposure modes.
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