Nikon D5000 - Manual (Page 216)

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Optional Flash Units (Speedlights)
The camera supports the Nikon Creative Lighting System (CLS) and can be used with
CLS-compatible flash units. Optional flash units can be attached directly to the
camera accessory shoe as described below. The accessory shoe is equipped with a
safety lock for flash units with a locking pin, such as the SB-900, SB-800, 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 is
attached.
The Nikon Creative Lighting System (CLS)
Nikon’s advanced Creative Lighting System (CLS) offers improved communication
between the camera and compatible flash units for improved flash photography.
A
The AS-15 Sync Terminal Adapter
When the AS-15 sync terminal adapter (available separately) is mounted on the camera
accessory shoe, flash accessories can be connected via a sync cable.
D
Use Only Nikon Flash Accessories
Use only Nikon flash units. Negative voltages or voltages over 250 V applied to the accessory
shoe could not only prevent normal operation, but damage the sync circuitry of the camera
or flash. Before using a Nikon flash unit not listed in this section, contact a Nikon-authorized
service representative for more information.