Canon 580EX - Speedlite II - Hot-shoe clip-on Flash Instruction Manual page 35

Multi-5peed[ite, Wireless Lighting Configurations
You can crate t%yo or three slave groups and set the flash ratio fn r E-TTL II
autafiiash shooting (p.38 - 42).
Wireless flash with two slave groups [p.38]
Outdoors
1sm (49-21 t.)
Wireless flash with three slave groups (p.40)
Indoors C
15m [49 .2ft.]
outdoors ' lOm (32 .8f1.)
yS
I
8m (26 .2f1 .) 12m [39 .4ft .]
33
Sm [26.2ft.] 12m (39 .4ft .)