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A Flash Control for Optional Flash Units
When an optional flash unit is connected, the Flash control > Flash
control mode (built-in) option in the photo shooting menu changes
to Flash control mode (external).
A Flash Control Mode
In i-TTL flash control, the camera sets the flash level based on light
reflected from a series of nearly invisible preflashes (monitor
preflashes) emitted immediately before the main flash fires. The
camera supports the following i-TTL flash control modes:
• i-TTL balanced fill-flash for digital SLR: Preflashes reflected from objects in
all areas of frame are picked up by 180K-pixel (approximately
180,000-pixel) RGB sensor and are analyzed to adjust flash output for
natural balance between main subject and ambient background
lighting. If type G, E, or D lens is used, distance information is included
when calculating flash output. Not available when spot metering is
used.
• Standard i-TTL fill-flash for digital SLR: Flash output adjusted to bring
lighting in frame to standard level; brightness of background is not
taken into account. Recommended for shots in which main subject is
emphasized at expense of background details, or when exposure
compensation is used. Standard i-TTL fill-flash for digital SLR is
activated automatically when spot metering is selected.
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