Canon Speedlite 90EX - Manual (Page 22)

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 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.
x
M
Approx.
8 m
(26.2 ft.)
Indoors
Outdoors
Approx.
10 m
(32.8 ft.)
Approx. 7 m
(23.0 ft.) Transmission distance Approx. 5 m
(16.4 ft.)
Approx. 80°
COP
Y