Nikon D500 Users Manual - English for customers in Asia Oceania the Middle Eas - Page 224
i-TTL Flash Control, i-TTL balanced fill-flash for digital SLR
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A i-TTL Flash Control When a CLS-compatible flash unit is set to TTL, the camera automatically selects one of the following types of flash control: • i-TTL balanced fill-flash for digital SLR: Flash unit 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 180K (180,000) 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 page 250). 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. 198