Canon Speedlite 90EX Instruction Manual - Page 27
Set the slave units., Set the master unit and shoot.
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Wireless Flash with Three Slave Groups You can have slave groups A and B and also add slave group C. You can use slave groups A and B to obtain the standard flash exposure of the subject, and slave group C to illuminate the background to eliminate shadows. 1 Set the slave units. See "Setting the Slave Units" on page 23 to set the slave unit's ID to , , or . For slave , also set the flash exposure C B compensation as necessary. A 2 Set the master unit and shoot. Follow "Setting the Master Unit Flash Ratio" on page 23. In step 1, select . If is set, the slave unit in slave group will not fire. If you point the slave unit in slave group toward the subject, the subject will be overexposed. 25
25
You can have slave groups A and B and also add slave group C. You can use slave groups
A and B to obtain the standard flash exposure of the subject, and slave group C to illuminate
the background to eliminate shadows.
1
Set the slave units.
See “Setting the Slave Units” on page 23 to set the
slave unit’s ID to <
1
>, <
2
>, or <
3
>.
For slave <
3
>, also set the flash exposure
compensation as necessary.
2
Set the master unit and shoot.
Follow “Setting the Master Unit Flash Ratio” on
page 23. In step 1, select <
k
>.
Wireless Flash with Three Slave Groups
A
B
C
If <
l
> is set, the slave unit in slave group <
3
> will not fire.
If you point the slave unit in slave group <
3
> toward the subject, the subject will be
overexposed.