5. Select correct lens opening
for film/flash
combination.
The short burst of light pro-
duced by electronic flash (often 1 /1000th
second or faster) is too brief for your
camera's Exposure Meter to measure. For
this reason, all electronic flash units have
calculator dials or scales which
indicate
the correct lens opening.
A.
With
Computer (Automatic) Flash
Units.
Set calculator dial of flash to correct
ASA film speed. Your flash dial will
now indicate the correct lens opening
for photography at a wide
range of
distances.
Set lens Aperture Ring (26) to the aper-
ture indicated by your flash dial. You
can now take pictures at any distance
within the range indicated by your flash
without further adjustments.
B. With Manual (Non-Automatic) Flash
Units.
Set calculator dial of Flash to
correct ASA film speed. Your flash dial
will now indicate the correct lens
openings for various distances. Focus,
and set lens Aperture Ring (26) to the
aperture indicated by your flash for
the
actual camera-to-subject distance, as
shown by your lens' distance scale
(28).
All photographs taken at this
flash-to-
subject distance will be pro
perly
exposed.
D
ifferent makes of electronic flash units
use different calculator dials or scales; for
exact information, please consult the in-
struction manual for your flash or check
with your camera dealer.