A-ttl flash program ae, 430ez, Flashes – Canon EOS-1 User Manual
Page 24: New flash technology gives you your kind of light, 430ez flashes
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New flash technology gives you
your kind of light.
A-TTL flash program AE
Canon’s A-TTL auto flash system
yields natural-looking flash photo
graphy. Flash synchro speeds range
from 1/250 to 1/60 second. A
warning is given before exposure if
the subject is out of flash coupling
range. And flash output is controlled
automatically via measurement of
the light reflected off the film plane.
With fill-in flash, the flash level is
automatically adjusted by the A-TTL
flash program AE to maintain a
natural balance between the
brightness of the subject and the
background. Upon flash charge
completion, the A-TTL flash
program AE automatically sets the
shutter speed according to the
brightness of the background. The
aperture value for exposure is
determined based on both the
background brightness as detected
by the camera body in the four outer
zones of the evaluative metering
system and on the main subject’s
distance, determined by the flash
unit’s infrared preflash function.
430EZ
FLASHES