202nOptional Flash Units (Speedlights)The camera supports the Nikon Creative Lighting System (CLS) and can be used withCLS-compatible flash units. Optional flash units can be attached directly to thecamera accessory shoe as described below. The accessory shoe is equipped with asafety lock for flash units with a locking pin, such as the SB-900, SB-800, SB-700,SB-600, and SB-400.1 Remove the accessory shoe cover.2 Mount the flash unit on the accessory shoe.See the manual provided with the flash unit for details.The built-in flash will not fire when an optional flash unit isattached.A The AS-15 Sync Terminal AdapterWhen the AS-15 sync terminal adapter (available separately) is mounted on the cameraaccessory shoe, flash accessories can be connected via a sync cable.D Use Only Nikon Flash AccessoriesUse only Nikon flash units. Negative voltages or voltages over 250 V applied to the accessoryshoe could not only prevent normal operation, but damage the sync circuitry of the cameraor flash. Before using a Nikon flash unit not listed in this section, contact a Nikon-authorizedservice representative for more information.