Pentax 645 645 Manual - Page 52

Dedicated, Flash, Precautions

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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 s 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 AF200T, the auto flash confirmation is also signified by an audible buzzing. 50 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.

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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
s
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
AF200T,
the
auto
flash
confirmation
is
also
signified
by
an
audible
buzzing.
50
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.