Canon Speedlite 90EX - Manual (Page 26)

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2
Set the flash ratio.
3
Take the picture.
 Set the camera in the same way as with normal
flash shooting.
 The flash ratio range of 8:1 - 1:1 - 1:8 is equivalent to 3:1 - 1:1 - 1:3 in stops (1/2-stop
increments).
 The flash ratio under the Z mark is shown in parentheses below the scale.
(5.6:1) (2.8:1) (1.4:1) (1:1.4) (1:2.8) (1:5.6)
8:1 4:1 2:1 1:1 1:2 1:4 1:8
COP
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