Nikon D2H D2H User's Manual - Page 121
AF-Assist for Multi-Area AF, i-TTL Flash Control
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Taking Photographs-Flash Photography AF-Assist for Multi-Area AF The SB-800 features AF-assist illumination linked to the D2H focus areas, allowing autofocus to be used even at night, regardless of the subject's position in the frame. AF-assist illumination can be used in all AF-area modes, including single-area AF, dynamic-area AF, group dynamic-AF, and dynamicarea AF with closest-subject priority. If the subject is poorly lit, the AF-assist illuminator will light automatically when single-servo AF is used in combination with an AF-Nikkor lens (if a lens with an angle greater than 35 mm is used, the illuminator may not light if the focus area at the left or right edge of the frame are selected). i-TTL Flash Control When used with the D2H and set to TTL, the SB-800 automatically uses one of the following types of i-TTL flash control: Flash control Description Speedlight 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 five-segment TTL flash control sensor or 1,005-pixel RGB sensor and are analyzed in comi-TTL Balanced bination with information from matrix metering system to adjust Fill-Flash for flash output for natural balance between main subject and ambiDigital SLR ent background lighting. When type G 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; 124-127). Not available when spot metering is used. Flash output adjusted to ensure main subject is correctly exposed; brightness of background is not taken into account. Recommended Standard for shots in which main subject is emphasized at expense of backi-TTL Flash for ground details, or when exposure compensation is used. Standard Digital SLR i-TTL flash for digital SLR is activated automatically when spot metering is selected. 109