Center-
weighted.
The camera
collects expo-
sure informa-
tion over the
entire frame,
but when
making its
calculations
emphasizes
the 8mm cen-
ter circle (or
other size
chosen by
you, which
include 6mm,
10mm,
13mm, and
an averaging
option)
shown in the
viewfinder. You'll find more details
on these options in Chapter 2.
Spot. Exposure is calculated
entirely from a 3mm circular spot
approximating the currently
selected focus area.
Semiautomatic and
Manual Exposure
Modes
The Nikon D200 has three semiautomatic
exposure modes that enable you to specify
shutter speed, aperture, or combinations of
the two; and a Manual exposure mode that
gives you the complete freedom to set the
shutter speed and aperture. You also set
these four exposure modes using the mode
dial. Your choices include:
1.20
Metering modes.
Chapter 1
Exploring the Nikon D200
Program. In this mode, the D200
automatically chooses an appropri-
ate shutter speed and f-stop to
provide the correct exposure.
However, you can override these
settings in several ways. In all
cases, if your attempted adjust-
ments result in an exposure
beyond the range of the system
(that is, you're asking for a shutter
speed or f-stop that's not avail-
able), either HI or LO appears in
the viewfinder.
Rotate the main command dial
•
to the left to change to a slower
shutter speed and smaller
f-stop combination that
provides the same overall
exposure.
Rotate the main command
•
dial to the right to change to
a higher shutter speed and
larger f-stop combination that
provides the same overall
exposure.
Hold down the EV button and
•
rotate the main command dial
to the left or right to add or
subtract exposure from the
metered exposure reading.
Shutter Priority. In this exposure
mode, you specify the shutter
speed with the main command
dial, and the D200 selects an
appropriate f-stop. The HI and LO
warnings appear if you exceed the
range of available settings.
Aperture Priority. In this exposure
mode, you specify the f-stop to be
used with the sub-command dial,
and the D200 selects the shutter
speed for you, or displays the HI
and LO indicators if this isn't
possible.
33