AUTO
A
S
A-S
A-S
A
S
AUTO
AUTO
A
S
A-S
61
62
The average light of the entire picture area is
measured, with emphasis on the center.
Center average exposure metering mode (A)
(Set the exposure metering mode selector lever to “
A
”.)
The light in the circle at the center of the picture
area is measured to determine the exposure.
This mode is best suited for strongly high-key
subjects, or when you desire to measure a
specific area. When the spot you want to
measure is not at the center of the frame, use
the AE lock function. (See pages 65-66 AE Lock
Mode.)
Spot exposure metering mode (S)
(Set the exposure metering mode selector lever to “
S
”.)
Exposure Metering Modes
With the A-S auto metering mode, average or
spot exposure metering is selected automati-
cally and the appropriate exposure is set
accordingly.
The spot mode is selected automatically when
the brightness within the spot metering area is
lower than the brightness of the average
metering area by about 1.5 EV or greater. The
average mode is selected when the spot
exposure metering value is the same or brighter
than the average value. When the difference
between the spot value and average value is
between 0.75 and 1.5 EV, the appropriate
exposure is achieved at an intermediate value.
How to change to the Exposure Metering Modes
While pressing the exposure metering mode selector lever lock release button in, turn
the exposure metering mode selector lever up or down.
If a polarizing filter is necessary, use a circular
polarizing filter. A linear polarizing filter is not
compatible with the Mamiya 645 AFD and its
operations.
Average/spot auto switching exposure metering
mode (A-S AUTO)
(Set the exposure metering mode selector lever to “
A-S
”.)
Holding time of the metered exposure value can be altered.
Custom settings (C-06 on page 89)
AUTO
A
S
A-S
