PROFESSIONAL MACRO Ring Flash Light Works with Nikon D600 DSLR - Full E-TTL I/II - Extreme Close-up Photography - IGBT - Micro Quality - Adapter Rings - 5600K Color Temp - EV Control - Photo Edge! TTL Guide Number: 46 feet (50mm @ ISO 100) PROFESSIONAL For Macro, Medical and Hobby Photography COMPENSATING EV exposure control that synchs with Canon EOS SLR cameras ADAPTABLE Bounce and swivel zoom head allows versatile reflection for difficult lighting conditions GURANATEED Brand New & 1 Year Limited Warranty