FLASH PHOTOGRAPHY——————————————————————————————Nikon dedicated electronic speedlights, including SB-24, SB-23, SB-22,SB-20, SB-18, SB-16B and SB-15, take full advantage of the F4's built-incomputer, which automatically synchronize the camera's shutter speedand lens aperture to provide precisely controlled exposures. This meansyou can perform automatic balanced fill-flash in TTL mode in every flashshooting situation, for beautiful, naturally balanced exposure for fore-grounds and backgrounds.Using automatic balanced fill-flash, the F4 together with a Nikon speedlightallows the photographer a choice of different flash techniques, such asMatrix Balanced Fill-Flash and Center-Weighted Fill-Flash.The Nikon SB-24 Speedlight lets you take advantage of a special photographic tech-nique called rear-curtain sync flash. For details, see page 84.