348nThe Nikon Creative Lighting System (CLS)Nikon’s advanced Creative Lighting System (CLS) offers improvedcommunication between the camera and compatible flash unitsfor improved flash photography.❚❚ CLS-Compatible Flash UnitsThe camera can be used with the following CLS-compatible flashunits:• The SB-900, SB-800, SB-600, SB-400, and SB-R200:• SU-800 Wireless Speedlight Commander: When mounted on a CLS-compatible camera, the SU-800 can be used as a commander forremote SB-900, SB-800, SB-600, or SB-R200 flash units. TheSU-800 itself is not equipped with a flash.Flash unitSB-900 1 SB-800 SB-600 SB-400 SB-R200 2FeatureGuideNo. 3ISO 100 34/111 38/125 30/98 21/69 10/33ISO 200 48/157 53/174 42/138 30/98 14/461 If a color filter is attached to the SB-900 when v or N (flash) is selected forwhite balance, the camera will automatically detect the filter and adjust whitebalance appropriately.2 Controlled remotely with built-in flash in commander mode or using optionalSB-900 or SB-800 flash unit or SU-800 wireless Speedlight commander.3 m/ft., 20 °C (68 °F), SB-900, SB-800, and SB-600 at 35 mm zoom head position;SB-900 with standard illumination.A Guide NumberTo calculate the range of the flash at full power, divide the GuideNumber by the aperture. For example, at ISO 100 the SB-800 has a GuideNumber of 38 m or 125 ft. (35mm zoom head position); its range at anaperture of f/5.6 is 38÷5.6 or about 6.8 meters (or in feet,125÷5.6=approximately 23 ft. 7 in.). For each twofold increase in ISOsensitivity, multiply the Guide Number by the square root of two(approximately 1.4).
