Canon Speedlite 58OEX Instruction Manual page 33

Multi-Speedlite, Wireless Lighting Configurations
You can create two or three slave groups and set the flash ratio for E-TTL II
autoflash shooting (p.38 - 42).
Wireless flash with two slave groups
(p.38)
Outdoors
,
,
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+
10m (32.8ft.)
~B
8m (26.2ft.) 12m (39.4ft.)
Wireless flash with three slave groups (pAO)
10m (32.8ft.)
12m (39.4ft.) 8m (26.2ft.)
,
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I
'I'
33