Nikon D70S - Manual (Page 104)

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Taking Photographs—Flash Photography
The D70S is equipped with a Guide Number 15/49 Speedlight (ISO 200,
m/ft; Guide Number at ISO 100 is 11/36). When a CPU lens is attached, the
built-in Speedlight emits monitor prefl ashes that are analyzed using through-
the-lens (TTL) technology (i-TTL fl ash control). The built-in Speedlight can be
used not only when natural lighting is inadequate, but also to fi ll in shadows
and backlit subjects or to add a catch light to the subject’s eyes.
i-TTL Flash Control
The following types of fl ash control are available with CPU lenses:
Flash Photography
Using the Built-in Speedlight
Description Flash control
i-TTL Balanced Fill-Flash for Digital SLR is selected automatically in all
modes except mode M or when spot metering is selected in modes
P, S, and A. Speedlight emits series of nearly invisible prefl ashes
(monitor prefl ashes) immediately before main fl ash. Prefl ashes
refl ected from objects in all areas of frame are picked up by 1,005-
pixel RGB sensor and are analyzed in combination with information
from matrix metering system to adjust fl ash output for natural
balance between main subject and ambient background lighting.
If type G or D lens is used, distance information is included when
calculating fl ash output.
i-TTL Balanced
Fill-Flash for
Digital SLR
Standard i-TTL Flash for Digital SLR is activated automatically in
mode M and when spot metering is selected in modes P, S, and A.
Flash output adjusted to ensure main subject is correctly exposed;
brightness of background is not taken into account. Recommended
for shots in which main subject is emphasized at expense of back-
ground details, or when exposure compensation is used.
Standard
i-TTL Flash for
Digital SLR
When a non-CPU lens is attached, the built-in Speedlight can only be used
when Manual is selected for Custom Setting 19 (Flash mode;
150). If
TTL selected, the shutter release will be disabled when the built-in Speedlight
is raised. The fl ash-ready indicator ( ) in the viewfi nder and the icon and
borders of the fl ash sync mode indicator in the control panel will blink.
19—Flash Mode ( 150)
Flash mode can be selected from TTL, Manual, and Commander mode. In Manual
mode, the built-in Speedlight has a Guide Number (m/ft) of 17/56 (ISO 200) or 12/39
(ISO 100). Commander mode can be used for wireless off-camera fl ash photography
with SB-800 or SB-600 Speedlights.