Nikon D7500 Users Manual - English for customers in Asia Oceania the Middle Ea - Page 191
Flash Control for Optional Flash Units, Flash Control Mode, i-TTL balanced fill-flash for digital SLR
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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. 165