Canon Speedlite 90EX Instruction Manual - Page 22
positioning the slave units. - as master
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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.) Position the slave unit using the mini stand supplied with the slave unit (the one with a tripod screw hole). For slave units with the horizontal bounce function, point the sensor of the slave unit toward the master unit. Indoors, the wireless signal can also bounce off the wall so there is more leeway in positioning the slave unit(s). If the sensor on the slave unit is not facing the master unit, the slave unit may not fire. After positioning the slave unit(s), be sure to test the wireless flash operation before shooting. To avoid interference with the transmission, do not place any obstacles between the master unit and slave unit. 20