Canon A-1 - Manual (Page 149)

switch to 1/60 sec. as soon as the Speedlite
is ready for firing.
These Speedlites employ a unique light
sensing system which reduces excessive
reflection from the central area to give
better overall exposure.
With the Speedlite 199A, shutter speeds
slower than 1/60 sec. can be optionally
selected for the effect of a lighter back­
ground. It is a powerful flash unit with
a guide number of 30m (ASA 100). To
control depth of field, you can choose be­
tween three working apertures (f/2.8, f/5.6,
and f/11 for ASA 100 film) that are auto­
matically preset by the camera as soon as the
pilot lamp comes on. The 199A also allows
bounce flash and flash coverage of a 24mm
lens field with the wide angle adapter. Its
thyristor circuit offers you continuous flash
shooting at close distances.
General Flash Photography
When you use the A-1 with flash units other
than the Speedlites 199A, 177A, 155A and
133A, set the AE mode selector to Tv and
the shutter speed to 1/60 sec. or slower.
With this setting on the camera, other types
of electronic flash units can be synchronized
with your A-1 either through the hot shoe or
via the PC socket on the front of the camera
body. These allow two separate flash units
to be fired simultaneously.
Aperture should be manually set on the
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