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FLASHPHOTOGRAPHY
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46
F
or
snapshots at night, in dark places, and in
indoor
shooting, flashbulbs
or
electronic flash can
be
used
to
good
advantage. Flash units also provide auxiliary light for taking
pictures
of
against-the-light subjects.
•
For
flash shooting, an exclusive accessory shoe
is
mounted
to
the
bottom
of
the
rewind
knob
of
the camera.
•
The
flash unit
is
inserted from
the
rear
of
the accessory
shoe and secured by tightening its
mount.
• Insert the plug
of
the flash
unit
into the camera's synchro
terminal,
the
FP
terminal (above) for flashbulb and
the
X
terminal (below) for electronic flash.
•
The
FP
Class flashbulb synchronizes with
the
shutter
at all
speeds from 1 second
to
1/1000
second.
For
electronic
flash, set
the
speed
to
the
red
"X"
mark midway between
1/30
sec and
1/60
sec,
but
slower speed settings can also
be used.
For
details, refer to
the
table on
the
next
page.
• The F Class and M Class bulbs can also be used with slow
shutter
speeds (slower than
1/30
sec)
but
whenever
possible use
the
FP
Class bulbs.
• Each
type
of
flashbulb
or
electronic flash has a Guide
Number
to
indicate its light
output.
Exposure should be
calculated from these guide numbers. The Guide Number
is
the
product
of
"distance to subject" multiplied by
the
lens aperture value.
From
this relationship, the correct
lens aperture can be
obtained
by
dividing the Guide
Number with
the
"distance
to
the
subject".
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