Sea&Sea YS-D3, Instruction Manual

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Some digital cameras operate with the main flash after dimming with an
advance flash. This advance dimming is called a pre-flash.
● When using a fiber-optic cable, set the mode switch to this position
for digital cameras without pre-flash modes.
● When using a fiber-optic cable, set the mode
switch to this position for digital cameras
with pre-flash modes.
The emission color of character will change with mode selection.
Emission colors are shown in the table below.