Mamiya 645 AF - Manual (Page 23)

*If the difference between the manual setting and the metered value is greater
than 6 EV, "-u-" (under) or "-o-" (over) flashes in the viewfinder's LCD panel.
*Exposure compensation cannot be used while in the manual mode.
*When the difference between the manual setting and the metered value is
displayed in the viewfinder's LCD panel while in the manual mode and the
exposure compensation dial is set to a position other than "0", the value
displayed is the difference between the manual setting and the metered value
plus the exposure compensation value. This has no effect on the exposure.
X Mode (X)
This mode fixes shutter speed at the sync speed
of 1/125 sec. In this position, the dials lock and
cannot be rotated. (See pages 63-65.)
Time Mode (T)
This is a mechanically controlled mode for long
exposures. It consumes no battery power. (See
pages 55-56.)
*In the "X" exposure mode the lock function
is activated. Press the exposure mode dial
lock release button while turning the
exposure mode setting dial.
There are three exposure metering modes: "A" in which the
average light of the entire picture area is measured with
emphasis on the center, "S" in which the light in a spot at the
center of the picture area is measured, and "A-S" which
combines these two to automatically switch the mode according
to the extent of difference between the brightness of the light
metered in the two modes. The distribution ratio of the exposure
metering modes is set within an intermediate range.
See pages 45-46 for Exposure Metering modes.
See page 47 for Film Advance modes.
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