Positioning Remote Flash Units
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When positioning wireless slaves to light a subject, keep in mind the following:
• The effective communication range between master and remote flash units is approximately 33 feet (10
meters) in the front position, and approximately 16 to 23 feet (5 to 7 meters) at both sides. These ranges
may vary, depending on the ambient light.
• The flash head should not be aimed directly into the camera lens.
• The wireless TTL sensor is located on the side of the VS-510C, while the optical sensor is located on the
front. Make sure that the correct sensor is facing the master flash and that there is no obstruction between
the two units.
• When photographing outdoors or in bright ambient light, the sensors can be overwhelmed by ambient light,
which will lower their sensitivity.
• To avoid creating interference between flash units, using more than three in a single group is not
recommended.
