Nikon D810 Product Manual - Page 218
Flash Control Mode, Commander mode
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A Flash Control Mode The camera supports the following i-TTL flash control modes: • i-TTL balanced fill-flash for digital SLR: Flash emits series of nearly invisible preflashes (monitor preflashes) immediately before main flash. Preflashes reflected from objects in all areas of frame are picked up by RGB sensor with approximately 91K (91,000) pixels and are analyzed in combination with range information from matrix metering system 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. Precision of calculation can be increased for non-CPU lenses by providing lens data (focal length and maximum aperture; see 0 229). Not available when spot metering is used. • Standard i-TTL 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 flash for digital SLR is activated automatically when spot metering is selected. The flash control mode for the built-in flash can be selected using Custom Setting e3 (Flash cntrl for built-in flash, 0 331). The information display shows the flash control mode for the built-in flash as follows: Flash sync Auto FP (0 329, 330) i-TTL - Manual - Repeating flash - Commander mode 194