SU-800 Wireless Speedlight Commander: When mounted on a CLS- compatible camera, the SU-800 can be used as a commander for remote SB-910,SB-900,SB-800,SB-700,SB-600,SB-500, or SB-R200 flash units in up to three groups. The SU-800 itself is not equipped with a flash.

AGuide Number

To calculate the range of the flash at full power, divide the Guide Number by the aperture. If, for example, the flash unit has a Guide Number of 34 m or 111 ft (ISO 100, 20 °C/68 °F); its range at an aperture of f/5.6 is 34÷5.6 or about 6.1 meters (or in feet, 111÷5.6=approximately 19 ft 10 in.). For each twofold increase in ISO sensitivity, multiply the Guide Number by the square root of two (approximately 1.4).

AThe AS-15 Sync Terminal Adapter

When the AS-15 sync terminal adapter (available separately) is mounted on the camera accessory shoe, flash accessories can be connected via a sync terminal.

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