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Photos are under-exposed (too dark).
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Adjust strobe exposure setting.
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Adjust aperture (larger), shutter speed (slower), or ISO (lower)
setting.
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Move strobe(s) closer to your subject and check aiming.
Strobe will not fire when using sync cord.
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Make sure the strobe is turned on.
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Try a different sync cord.
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Restore camera to factory default settings and then re-configure
according to the housing instructions.
Strobe will not fire when using an optical sensor.
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Make sure the strobe is turned on.
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Test fire the strobe through the bulkhead. If it does not fire through
the bulkhead, then the strobe must be returned for repair.
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Make sure the signal flash is firing.
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Make sure the strobe sensor is pointed directly towards the signal
flash.
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Move the strobe sensor closer to the signal flash.
Ready light does not come on.
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Charge or replace battery pack.
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Make sure the strobe is turned on.
Backscatter or “snow” in images.
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Position your strobe(s) farther away from your lens and at a slight
angle.
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Avoid using strobes in extremely low-visibility conditions.