All units work directly with the camera's autofocus and metering system, and produce powerful and accurate flash illumination whenever needed. Maxxum AF flashes recycle quickly and let the user shoot correctly exposed flash pictures anytime, anywhere, and under any lighting condition with complete control and confidence.
The 5400HS offers an unparalleled combination of high speed and high-performance. With the Maxxum 700si, it can synchronize at any shutter speed up to 1/8000 sec., in any exposure mode, with TTL control. With the Maxxum 600si, sync speeds up to 1/4000 sec. can be achieved. The 5400HS can be used off-camera in wireless mode, and when attached to 9xi, 700si, or 600si, can also control off-camera 3500xi, guide number of 177 feet (54 meters) at ISO 100, the 5400HS is capable of out-performing virtually any accessory flash in its class. Other features include ratio control, multi flash, bounce flash, and a dual-mode modeling flash.