Capture well-lit photos with your Nikon DSLR camera using this Bower Digital Power Zoom SFD680N external flash. Which features an auto zoom flash head that automatically adjusts itself to accommodate focal lengths from 28mm to 85mm. The Digital Power Zoom Autofocus 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 economical flashgun featuring an auto-zoom flash head, which auto-senses the focal length of the camera's lens, and adjusts itself accordingly. It is equipped with a guide number of 139 feet with full i-TTL metering, automatic shutter speed control and aperture control of digital and analog SLR cameras. Its light output is adjustable with a range of +/-1 EV in 0.5 increments. 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. Auto zoom flash head. Detects camera focal lengths from 28mm to 85mm and adjusts itself accordingly. 139' guide number (85mm @ ISO 100). With full i-TTL metering, automatic shutter speed control and aperture control provides ample illumination from a distance. Bounce and swivel capabilities. Make it easy to add creative lighting effects to your photos. Bower SFD680 Specs. Flash Duration 1/700 Second at Full Power. Mount Shoe.