Pentax 645 - PROGRAMMED AUTO FLASH OPERATION

PROGRAMMED AUTO FLASH OPERATION
• When combined with a Pentax dedicated auto
flash (AF400T, AF280T, AF200T or AF200SA),
a predetermined f/stop is automatically set,
should the aperture ring be set at the ''A''
position.
The completion of flash charging will
automatically switch the shutter speed to 1/60
sec. The ^ indication appears in the externa! LCD
window and the viewfinder LED, indicating
that the charging has been completed.
Aperture set to "A" [Programmed AE, Aperture-
priority AE or shutter-priority AE],
• Adjust the flash mode selector of the AF200T,
AF280T or AF400T, to the auto position (red,
green or yellow).
• Simultaneously with the completion of the
charging, the viewfinder LED display indicates
1/60 sec. According to the auto positions (red,
green or yellow), the f/stop automatically varies
as shown in the table below, (f/4 with AF200SA
with ISO 100 film)
AF200T
AF280T
AF4O0J
Red
f/2.8
F/4
f/4
Green
f/5.6
f/8
f/8
Yellow
-
—
f/11
(Example: Should the selector of the AF200T be
positioned at the “red'" indication (ISO 100 film)
the aperture automatically adjusts to f/2.8.)
As the film speed changes, the f/stop
automatically changes; however, the maximum
f lash-to-subject distance remains unchanged.
Also refer to your flash unit operation manual.
Aperture set at a given f/stop [either Aperture-
priority AE or Metered manual mode],
• Adjust the selector of the auto flash unit to
"AUTO” position (red, green or yellow).
• Set the f/stop in accordance with the flash
calculation guide found on the flash unit.
• With a dedicated auto flash unit, the completion
of the charging automatically adjusts the shutter
speed to 1/60 sec.
(In metered manual mode, flash synch at a
slower shutter speed under 1/60 sec. is also
possible.)
In this case, although you can set the exposure
compensation button with the indication shown
in the viewfinder, the exposure compensation
function, in effect, does not work.
(With ISO 100 film)
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