The Canon Speedlite 580EX II is a powerful professional flash with a Guide Number of up to 58 meters (at ISO 100 and 105mm). It features a weather-sealed design, full tilt and swivel head capability, and supports E-TTL II technology for accurate metering. B&H Photo B&H Photo +2 Key Technical Specifications: Performance and Power: Guide Number of 58 (at 105mm, ISO 100), making it one of the most powerful flash units in its class. Compatibility: Compatible with Canon EOS cameras (E-TTL II system). Head Control: Head can tilt up to 90 degrees and swivel 180 degrees in both directions. Durability: Reinforced body with good resistance to dust and moisture, with a metal hot shoe for better stability and connection. Recharge: 20% faster recharge speed compared to the previous model (580EX) with completely silent operation. Additional Features: Autofocus assist beam. Ability to control flash settings via the camera menu (on compatible cameras). Support for High-speed sync feature.