318A Flash Control ModeThe information display shows the flash control mode for optionalflash units attached to the camera accessory shoe as follows:Flash sync Auto FP (0 282)i-TTLAuto aperture (AA)Non-TTL auto flash (A)Distance-prioritymanual (GN)ManualRepeating flash —Advanced wirelesslightingD Use Only Nikon Flash AccessoriesUse only Nikon flash units. Negative voltages or voltages over 250 Vapplied to the accessory shoe could not only prevent normaloperation, but damage the sync circuitry of the camera or flash. Beforeusing a Nikon flash unit not listed in this section, contact a Nikon-authorized service representative for more information.