Guide Number 21 m/69 ft. (at ISO 100, 18mm zoom-head position, 20C/68F) to 30 m/98.4 ft. (at ISO 200, 18mm zoom-head position, 20C/68F) Lens Coverage 18mm (DX-format) 27mm (on a Nikon F6) Bounce Function (Tilt) Flash head tilts up to 90 with click-stops at 0, 60, 75, 90. Dimensions 2.6 x 2.2 x 3.1 in. (66 x 56.5 x 80 mm) (Approx.) Weight (Approx. without batteries) 4.5 oz. (128 g) Guide Number 21 m/69 ft. (at ISO 100, 18mm zoom-head position, 20C/68F) to 30 m/98.4 ft. (at ISO 200, 18mm zoom-head position, 20C/68F) Electronic Construction Automatic Insulated Gate Bipolar Transistor (IGBT) and series circuitry Flash Exposure Control i-TTL Balanced Fill-Flash with CLS compatible cameras Manual Manual Flash (with Nikon Creative Lighting System digital and 35mm SLR cameras) Rear-curtain sync Red-eye reduction Red-eye reduction in Slow-sync Shooting options: FV Lock Flash Slow-sync Lens Coverage 18mm (DX-format) 27mm (on a Nikon F6) Bounce Function (Tilt) Flash head tilts up to 90 with click-stops at 0, 60, 75, 90. Minimum Recycling Time 2.5 sec. (approx.) with Ni-MH batteries 3.1 sec. (approx.) with Oxyride batteries 3.9 sec. (approx.) with Alkaline batteries 4.2 sec. (approx.) with Lithium batteries Flash Duration 1/300 sec. at M 1/1 (full) output. (Approx.) Power ON/OFF Turn the SB-400 on and off using the ON/OFF switch. Required Power Source Two 1.5V or lower (Alkaline-manganese, Lithium, Oxyride) batteries Two 1.2V 2600mAh (Ni-MH rechargeable) batteries Flash-ready Indicator Blinks: insufficient light, insufficient battery power, incompatibility of camera with SB-400 or overheating. Ready Light Back Minimum Number of Flashes / Recycling Time 90/430 sec. (1000mAh NiCd) 140/3.9-30 sec. (1.5V Alkaline-manganese) 150/3.1-30 sec. (1.5V Oxyride) 210/2.5-30 sec. (1.2V Ni-MH) 250/4.2-30 sec. (1.5V Lithium) Wireless Groups No Dimensions 2.6 x 2.2 x 3.1 in. (66 x 56.5 x 80 mm) (Approx.) Weight (Approx. without batteries) 4.5 oz. (128 g)
