Mamiya 645DF, User Manual

Page: 27 / 149

27
3.4 Measuring Light – Exposure Metering
1. Press button
A
to adjust the exposure metering mode. There are
three different exposure metering mode options that are displayed
sequentially when either the front or rear dial is turned. Select an
appropriate exposure mode. Your chosen exposure metering mode is
displayed as an icon on the camera’s LCD screen.
2. Press the SET button
B
or exposure metering mode button A to
enter the setting.
Exposure Warnings
Users are warned when shooting subjects that are too bright or too dark
with an inappropriate exposure setting. At such times, when the correct
exposure cannot be obtained, users are alerted by the numeric exposure
display that flashes on the external LCD or on the display inside the
viewfinder.
Warnings that the exposure is outside the metering range
• Program AE (P)
The shutter speed and f-number blink.
• Aperture priority AE (Av)
The shutter speed blinks.
• Shutter priority AE (Tv)
The f-number blinks.
• Manual mode (M)
The exposure metering value difference is displayed.
Average/spot auto
exposure metering
Exposure metering is performed after automatically
selecting average/spot exposure metering.
• Depending on the subject conditions, center-
weighted average/spot exposure metering is selected
automatically, and the correct exposure is measured.
• Spot exposure metering is automatically selected when
the brightness of the spot exposure metering range
becomes darker than the brightness of the entire screen.
• If there is very little difference between the spot
exposure metering value and center-weighted average
exposure metering value, the correct exposure level is
obtained as the intermediate value.
Center-weighted
average/spot
exposure metering
The average brightness of the entire screen is measured,
emphasizing the center of the screen.
Center spot exposure
metering
The brightness of an area equivalent to 7.6% at screen
center is measured, and the exposure is determined.
The circle at screen center serves as a general guideline.
This mode is suited to measuring subjects with strong
contrasts or measuring only screen portions.
Viewer display

P
Av
Tv
M
X
CF
C1
C2
C3
P Av
Tv
M
X
CF
C1
C2
C3
A
B