Pentax 645 - COMMON USE FOR TTL AUTO AND EXTERNAL AUTO FLASH MODES

Common use for TTL auto and external auto
flash modes
Flash synchronization at a slower speed:
In Metered manual mode, the shutter speed in the
area of 1/125 sec. through 1/1000 sec. will
automatically switch to 60 (1/60 sec.) with the
completion of flash charging. All speeds slower
than 1/60 sec. can be used for flash
synchronization according to the requirements, thus
permitting flash photography with synchronization
at a slower shutter speed. Simultaneously with the
completion of flash charging, the ^ marking
indication will appear in the external LCD and
within the viewfinder's LED.
Auto flash confirmation mark |-»)
In each of the photographic modes, the auto flash
confirmation marking will appear. Should the flash
photography take place within the flash coupling
range of the TTL auto flash units (TTL and the
Programmed auto flash units), the ^ marking on
the viewfinder's LED display will be lit or will flicker
immediately following flash discharge, which
Indicates "auto flash confirmation". Its appearance
assures that proper flash exposure has been
rendered to the subject.
Flash coupling range to activate the auto flash
confirmation mark may vary depending upon certain
limitations according to the subject situation.
With the AF2CX)T, the auto flash confirmation is
also signified by an audible buzzing.
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DEDICATED FLASH PRECAUTIONS
• When setting the flash mode selector to MS
(Manual synch.) or to the M (Manual) position
utilizing a dedicated auto flash unit, adjust the
aperture to the respective f/stops. The same
procedure must apply to multiple flash operation.
Setting to the “A” position will not provide
proper exposure.
The functions of the MS or M may vary
depending upon the type of dedicated auto flash
unit in use. It is recommended that the flash
unit instructions be read and followed for
optimum results.
• TTL and external auto flash operation is possible
at 60 (1/60 sec. fixed) or B.
When the shutter speed has been set at the B
position, the B shutter speed will not switchover
to that of flash synchronization, even when
flash charging has been completed.
• Should the power switch of a dedicated flash
unit be kept ON, the power source timer for the
camera's exposure meter will be kept turned
ON. Once the charging process has been
completed, do not fail to turn the flash unit's
power switch to the OFF position as soon as
the flash is no longer required.