4. Press and hold the WB button again until PRE starts
flashing.
5. Point the camera at a white or neutral gray card in the
light source under which you will be taking pictures. It
does not have to focus on the card; it can just be pointed
at the card so that it fills the frame.
6. Press the Shutter-release button fully, as if you were
photographing the white card. The shutter will fire, but
nothing will appear on the Monitor.
7. Check the Control panel to see if GOOD is flashing. If
you see No Gd flashing (instead of GOOD), the
operation was not successful. Your available light may
not be bright enough to take an accurate reading.
The PRE measurement is very sensitive since it uses the light
coming through the lens to set the WB. Unless you are
measuring in an extremely low-light level, it will virtually
always be successful.
In step 2, I mention that d-0 appears in the top-left corner of
the Control panel during a WB measurement (see
Figure 10-4). This d-0 is where the current WB value is
stored. There are four other memory locations, d-1 to d-4,
which you can use to store WB values you regularly use.
Later, you can copy a value stored in d-1 to d-4 back into d-0.
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