Nikon SB-500 AF Speedlight - Manual (Page 35)

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Flash Control Modes
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Camera’s metering mode and i-TTL flash control
• When the camera’s metering mode is changed to spot metering
while i-TTL balanced fill-flash is in use, the i-TTL flash control
automatically changes to the standard i-TTL flash.
• The i-TTL flash control automatically changes to i-TTL balanced
fill-flash, after changing the camera’s metering mode from spot
metering to other metering modes.
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When insufficient flash output for correct exposure
is indicated
• When the flash-ready indicators
on the SB-500 and in the camera’s
viewfinder flash slowly for
approximately 3 sec. after firing,
underexposure due to insufficient
flash output may have occurred.
• To compensate, use a wider aperture
(smaller f-number) or higher ISO
sensitivity, or move the flash unit
closer to the subject and reshoot.