Canon speedlite 155a – Canon AT 1 User Manual
Page 108
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
Canon Speedlite 155A
When the Speedlite 155A is used with the
AT-1, it is not necessary to set the shutter
speed on the camera as is the case with
ordinary electronic flash units. At any shutter
speed except "B", the shutter speed is
automatically adjusted to the X synchroni
zation speed of 1/60 sec. at the time the
155A is charged. To perform automatic flash
photography, set the prescribed f/stops on the
lens manually.
As the flash is automatically controlled to
the given aperture value by the light reflected
back from the central part of the subject, the
influence
of
the
background
is
greatly
reduced. Thus, the 155A offers more appro
priate flash exposure rather than conventional
flash units.