Nikon Flash Speedlight SB-700

Guide number (at 35mm zoom head position,in FX format,standrad illumination pattern,20°C/68°F) 28/92 (ISO 100, m/ft.), 39/128 (ISO 200, m/ft.) Effective flash output distance range(in i-TTL mode) 0.6m to 20m (2 ft. to 66 ft.) :varies depending on camera’s image area setting, illumination pattern, ISO sensitivity, zoom head position, and lens aperture in use) Illumination pattern [...]  See More..