Nikon D300 User Manual (en)

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When an SC-series 17, 28, or 29 sync cable is used for off-camera flash 
photography, correct exposure may not be achieved in i-TTL mode.  We 
recommend that you choose spot metering to select standard i-TTL flash 
control.  Take a test shot and view the results in the monitor.
In i-TTL, use the flash panel or bounce adapter provided with the flash 
unit.  Do not use other panels such as diffusion panels, as this may 
produce incorrect exposure.
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Use Only Nikon Flash Accessories
Use only Nikon Speedlights.  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 
Speedlight not listed in this section, contact a Nikon-authorized service 
representative for more information.