Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 196
Non-Canon Flash Units
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Non-Canon Flash Units Sync speed The camera can synchronize with non-Canon compact flash units at up to 1/250 sec. With large studio flash units, the flash duration is longer than that of a compact flash unit and varies depending on the model. Before shooting, confirm that flash sync is performed correctly by taking some test shots at a sync speed of approx. 1/60 sec. to 1/30 sec. PC terminal The PC terminal enables you to use flash units with a sync cord. The terminal has locking threads to prevent accidental cord detachment. The PC terminal has no polarity. Sync cords can be connected regardless of polarity. Caution Using the camera with a dedicated flash unit or flash accessory for cameras of other manufacturers poses a risk of malfunction and even damage. Do not connect flash units with an output voltage of 250 V or more to the camera's PC terminal. Do not attach a high-voltage flash unit to the camera's hot shoe. It may not fire. Note You can use one flash unit attached to the camera's hot shoe and another connected to the PC terminal at the same time. 196