Canon Speedlite 90EX Instruction Manual - Page 18

Positioning and Operation Range - flash unit

Page 18 highlights

Positioning and Operation Range Indoors x Outdoors M Approx. 8m (26.2 ft.) Approx. 80° Approx. 10 m (32.8 ft.) Transmission distance Approx. 5 m Approx. 7 m (16.4 ft.) (23.0 ft.)  The settings of the flash exposure compensation, high-speed sync (FP flash), FE lock, and manual flash set on the master unit are wirelessly and automatically set on the slave unit.  Even with multiple slave units, all of them will be controlled in the same way via wireless. 16

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16
Positioning and Operation Range
x
M
Approx. 80°
Approx.
8 m
(26.2 ft.)
Approx.
10 m
(32.8 ft.)
Approx. 7 m
(23.0 ft.)
Indoors
Outdoors
Transmission distance
Approx. 5 m
(16.4 ft.)
The settings of the flash exposure compensation, high-speed sync (FP flash), FE lock, and
manual flash set on the master unit are wirelessly and automatically set on the slave unit.
Even with multiple slave units, all of them will be controlled in the same way via wireless.