Light Is a Photographer’s Friend!What Is a Guide Number?Super-Duper flash unit GN informationNikon SB-400 flash unit GN information (real values)Flash ModesAutoFill Flash (Front-Curtain Sync)Red-Eye ReductionSlow SyncRear-Curtain SyncList of Flash Modes by Shooting ModeSCENE modes – Portrait, Child, Close up, Party/indoor, Pet portrait, and AUTOSCENE mode – Night portraitSCENE mode – FoodShooting mode – Programmed auto (P) and Aperture-priority auto (A)Shooting mode – Shutter-priority auto (S) and Manual (M)No Flash ModeFlash CompensationNikon Creative Lighting System (CLS)How Does the D610 Fit into the CLS Scheme?What Is Commander Mode and How Does It Work?Using Commander ModeCommander Mode SettingsSetting the Channel (CH) for CommunicationDownloadable Resource on Flash UnitsAuthor’s ConclusionsThank You!