The Digital Autofocus Flashgun for Nikon fully dedicated i-TTL flash designed specifically for the Nikon line of digital and film SLR cameras. Designed with professional and amateur photographers in mind, this flashgun is equipped with a guide number of 112 feet with full i-TTL metering, automatic shutter speed control and aperture control of digital and analog SLR cameras. Key Features: Auto standby and check indicator. Guide Number: 112 feet (50mm @ ISO 100). Bounce and swivel zoom head allows versatile reflection for difficult lighting conditions. 28mm-85mm zoom coverage. Compatible with all Nikon models including: D2X/Xs,D2Hs,D2X,D200,D3X/3S, D40/40X, D300S, D3000, D3100,D700,D7000,D5000,D5100,D50,D60,D70s, D80, D90. Bower SFD35N Specs. Flash Head. Guide Number 111.55' / 34 m at ISO 100 (50 mm Position). Coverage Full-Frame. 28 to 85 mm. Angle of Coverage 28 to 75°. Bounce Head 0 to +90°. Swivel Head 330°. Flash Duration 1/700 Second at Full Power. Recycle Time Approx. 4 to 6 Seconds. Secondary Illumination None. Exposure Control. Exposure Control Nikon i-TTL. Power Range None. Wireless. Wireless Operation None. Power. Internal Power 4 x AA (Alkaline, NiCad, NiMH). External Power Pack Compatible No. General. Mount Shoe. Off-Camera Terminal None. Dimensions (W x H x D) 3 x 2.4 x 7.3" / 76 x 60 x 185 mm. Weight 9.88 oz / 280 g (without Batteries)