Canon EOS 30D Instruction Manual page 101

Flash Photography
The built-in flash or an EOS-
dedicated, EX-series Speedlite
enables E- TTL II autoflash
(evaluative flash metering with
preflash), making flash
photography as easy as normal
shooting. The result is natural-
looking flash photos. In the Basic
Zone modes (except <t&>
<~>
<
m
», flash photography ;s fully
automatic. In Creative Zone modes,
flash can be used whenever
necessary.