Flash Units for Nikon Digital Cameras
Nikon calls their flash units "Speedlights" (not to be confused with Canon's "Speedlites"). The models vary in capability (and price) from the top-of-the-line SB-800 to the mid-range SB-600 to the no-frills, all-automatic SB-400. They're all compatible with Nikon's i-TTL system and the "Nikon Creative Lighting System" (CLS). CLS allows you to use multiple flashes at once, with all of them communicating with the camera (and the in-camera mini-flash can act as the "commander" for the other flashes on most recent Nikon SLRs).
