Nikon's premier speed light. I have had it for about a year and it has been incredible. It has recently been discontinued so they are not only hard to find, but are quite pricey once you do find one. Here are some of the main features: # Powerful, compact and portable i-TTL Speedlight unit optimized for use with Nikon's Creative Lighting System (CLS). # Nikon's most advanced Speedlight with a guide number of 184 feet (at ISO 100 at 105mm zoom-head position). # Operates a stand-alone Speedlight, wireless Speedlight Commander or wireless remote unit . # Advanced wireless control provides fully automatic and independent control of an unlimited number of SB-900, SB-800, SB-600 and SB-R200 Speedlights. # Control as many as 3 remote groups (A, B and C) with the SB-800's wireless Commander mode without leaving the camera position. Email with any questions. Thanks it's NOT ok to contact this poster with services or other commercial interests utah