Overview and Functionality
The SU-4 is designed to enable wireless synchronization between a master flash (or camera’s built-in flash) and one or more slave Speedlights. It detects the light from a master flash and triggers the attached Speedlight, providing seamless, synchronized lighting.
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Key features include:
- Wireless operation using optical detection of the master flash
- Supports TTL (through-the-lens) and manual flash modes for complete control
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- Effective range: approx. 7 meters (23 ft) in AUTO mode and up to 40 meters (131 ft) in MANUAL mode
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- Adjustable sensor angles: Rotates ±120° both vertically and horizontally to optimize slave flash triggering
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- Audible beep indicator to confirm successful flash firing
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- Can be mounted on a mini tripod or directly attached to a Speedlight via the accessory shoe
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- Lightweight and portable, making it convenient for field use
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