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Nikon SU-4 Wireless Remote TTL Flash Controller True wireless TTL control with most Nikon speedlights.Up to 23 feet in TTL AUTO mode.Ideal for use with Nikon speedlights in multiple flash lighting setups to reduce background shadows; provide a second light for fill or main light purposes; and for background or accent lights.Small and compact; fits on most tripods and light stands. Unique audible beep alerts for correct or incorrect exposure. Rotates 120°.
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