•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, 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 Sync Terminal

A sync cable can be connected to the sync terminal as required. Do not connect another flash unit via a sync cable when performing rear-curtain sync flash photography with a flash unit mounted on the camera accessory shoe.

429