Nikon D3s Body Only D3S User's Manual - Page 213

The Nikon Creative Lighting System (CLS) Nikon's advanced Creative Lighting System (CLS) offers improved communication between the camera and compatible flash units for improved flash photography. The camera can be used with the following CLS-compatible flash units: ❚❚ The SB-900, SB-800, SB-600, SB-400, and SB-R200: Flash unit Feature SB-900 1 SB-800 SB-600 SB-400 SB-R200 2 Guide ISO 100 34/111 No. 3 ISO 200 48/157 38/125 53/174 30/98 42/138 21/69 30/98 10/33 14/46 1 If a color filter is attached to the SB-900 when v or N (flash) is selected for white balance, the camera will automatically detect the filter and adjust white balance appropriately. 2 Controlled remotely with optional SB-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. ❚❚ SU-800 Wireless Speedlight Commander: When mounted on a CLS-compatible camera, the SU-800 can be used as a commander for remote SB-900, SB-800, SB-600, or SB-R200 flash units. The SU-800 itself is not equipped with a flash. l A Guide Number To calculate the range of the flash at full power, divide the Guide Number by the aperture. For example, at ISO 100 the SB-800 has a Guide Number of 38 m or 125 ft. (35mm zoom head position); its range at an aperture 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 ISO sensitivity, multiply the Guide Number by the square root of two (approximately 1.4). 187