Nikon D90 User Manual

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Flash Contacts
The D90 is equipped with an accessory shoe for attaching optional flash units directly 
to the camera.
❚❚The Accessory Shoe
Use the accessory shoe to mount optional flash units directly 
on the camera without a sync cable (pg. 234). The accessory 
shoe is equipped with a safety lock for Speedlights with a 
locking pin, such as the SB-900, SB-800, SB-600 and SB-400.
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The AS-15 Accessory Shoe Adapter 
When the AS-15 accessory shoe adapter (available separately) is mounted on the camera 
accessory shoe, flash accessories can be connected via a sync cable. 
Accessory shoe