Canon Speedlite 90EX Instruction Manual page 33

Wireless Master Function

Transmission channel ...................... 1 - 4
Transmission angle .......................... Approx. ±40° horizontally and approx. ±30° vertically
Transmission distance ..................... Indoors: Approx. 0.7 - 7 m / 2.3 - 23.0 ft., Outdoors:
Slave unit control ............................. 3 groups (A/B/C)
Flash ratio ........................................ 8:1 - 1:8, 1/2-stop increments
 AF-Assist Beam
 Power Source
Battery.............................................. Two size-AAA/LR03 alkaline batteries
Recycling time.................................. Approx. 0.1 - 5.5 sec.
Battery life (flash count) ................... Approx. 100 flashes or more
 Dimensions
(W x H x D)........... 44.2 x 52 x 65 mm / 1.7 x 2.0 x 2.6 in.
 Weight
....................................... Approx. 50 g / 1.8 oz. (excluding batteries)
All specifications above are based on Canon's testing standards.

Product specifications and external appearance are subject to change without notice.

..... Optical pulse method
0.7 - 5 m / 2.3 - 16.4 ft.
....................... Intermittent flash firing
Effective range: Center: Approx. 2.8 m / 9.2 ft.,
Periphery: Approx. 2.5 m / 8.2 ft.
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