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HVL-MT24AM_GB 2-889-493-01 (1)
37
Detailed operations
When twin flash units are at different power level settings
e values given in the preceding tables for the twin ash units assume that both
twin ash units are set at the same ash level.
When they are set to dierent ash power levels, the aperture needed for correct
exposure can be calculated using the following equation:
Aperture*
=
(A ash aperture)
2
+ (B ash aperture)
2
Example:
Using a 100mm F2.8 Macro lens with a pair of twin flash units with no
arm, “A” flash is set at a power level of 1/8, “B” flash unit is set at 1/16, and
the magnification ratio is 1:1
e A ash aperture set at a power level of 1/8 is f/19 and the B ash aperture set
at a power level of 1/16 is f/13 (refer to the table on 36 page).
Apply these results in the above equation.
19
2
+ 13
2
= 361 + 169 = 530 22
erefore, in the above example, an aperture setting of f/22 will give proper
exposure.
* When both twin ash units are used.
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