Canon EOS 20D - Manual (Page 91)

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6
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 <
3> <5>
<
7>), flash photography is fully
automatic. In Creative Zone modes,
flash can be used whenever
necessary.
First set the <
4> switch to <J>.