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Through-the-Lens Flash Photography
To use TTL flash control, connect an SB-80DX, SB-50DX, or SB-28DX Speedlight to
the camera and set the flash to D-TTL auto-flash mode. Depending on the type of
lens used, one or more of the following TTL flash modes will be available. TTL flash
control is available only with the SB-80DX, SB-50DX, and SB-28DX.
3D Multi-Sensor Balanced Fill-Flash for Digital SLR
Multi-Sensor Balanced Fill-Flash for Digital SLR
This mode is available when a CPU Nikkor lens is attached. Based on information
from the matrix metering system, flash output is adjusted to maintain a balance
between the main subject and ambient background lighting. When the shutter-
release button is pressed, the Speedlight emits a series of nearly invisible preflashes
(monitor preflashes) immediately before the shutter opens. The monitor preflashes
are reflected from objects in all areas of the frame and picked up by the camera’s
TTL multi sensor, where they are analyzed instantaneously in combination with infor-
mation on the current sensitivity (ISO equivalency) setting, aperture, lens focal length,
and exposure compensation value. The results of this analysis are used to balance
flash output with ambient light. When a type G or D lens is used, distance informa-
tion is included in the calculation for still more precise flash control (3D multi-sensor
balanced fill flash).
Center-Weighted Fill-Flash for Digital SLR
This mode is used with non-CPU lenses. When a non-CPU lens is attached, the
camera automatically chooses center-weighted metering, allowing flash output to be
roughly balanced with ambient lighting for the main subject and background. The
camera may be unable to adjust exposure correctly if the frame includes a highly
reflective object, or if the background is non-reflective. Standard TTL flash control is
recommended in such cases. Standard TTL flash control is activated automatically
when spot metering is selected.
Standard TTL Flash for Digital SLR
Standard TTL flash control is available with lenses of all types. Standard TTL flash
control does not take the brightness of the background into account, instead adjust-
ing flash output to ensure that the main subject is correctly exposed. This makes it
suited to photographs in which the main subject is emphasized at the expense of
other details, or when exposure compensation is used. This mode is also activated
automatically when spot metering is selected.
ADVANCED PHOTOGRAPHY—THROUGH-THE-LENS FLASH PHOTOGRAPHY