Canon 577 G - Manual (Page 32)

SLOW-SYNC FLASH PHOTOGRAPHY
(WITH NEW F-1 AND A-1 ONL Y)
In normal use, the best shutter
speed for flash photography with
most Canon SLRs, including the
New F-1 and A-1, is the X-sync
speed (1/90 sec. for New F-1 and
1/60 sec. for A-1). It is just slow
enough for the first shutter curtain
to travel across the film before the
second shutter curtain is released,
which means that the entire film will
be exposed to the flash. On the
other hand, it is just fast enough to
stop the motion of most subjects re­
quiring flash.
When you use this flash on a Canon
New F-1 or A-1, however, you have
the option of taking a flash picture
at a shutter speed slower than X-
sync. Simply set the 577G’s slow-
sync AUTO/MANU switch to MANU
and the camera’s shutter speed to a
speed slower than X-sync. Thus, for
the New F-1, set the shutter dial to
any speed between 1 /60 sec. and 8
sec; for the A-1, set the AT dial to
any speed between 1/30 sec. and
30 seconds. The picture will be
taken at the speed you have set on
the camera, and the flash will fire
after release of the first shutter cur­
tain. The advantage of using a shut­
ter speed slower than X-sync is that
the background will look lighter.
But, even with the switch set to
MANU, if the shutter speed that has
been set on the camera is at X-sync
or faster (i.e., 1/90 sec. or faster
with the New F-1, and 1/60 sec. or
faster with the A-1), the actual shut­
ter speed will be set automatically
to the X-sync. In all other respects,
use of the flash remains the same.
AUTO I Wl MANU. 1/60-30S
J
The shutter speed display in the
A-1's viewfinder will show the
one set with the AT dial.
With any camera other than the
New F-1 or A-1, it does not mat­
ter whether the slow-sync
AUTO/MANU switch is on AUTO.
The shutter speed is set accord­
ing to information on p. 12.
EFFECT OF AUTO/MANU POSITIONS AND
A-1 's "AT’ DIAL ON ACTUAL SHUTTER SPEED]
Setting of
Slow-Sync
AUTO/MANU
Switch
AT
Dial Setting
Actual
Shooting
Shutter Speed
AUTO
any setting
but “B"
1 /60 sec.
"B" “B"
MANU
1/60 sec. -
1 /1000 sec.
1 /60 sec.
1 /30 sec. -
30 sec.
speed set on
AT dial
"B" •■B"
28