Nikon autofocus speedlight SB-900 User Manual page 82

Taking close-up photographs with bounce-down flash
t
When shooting subjects closer than 0.6 m (2 ft.)
• With the SB-900 attached to the camera, sufficient illumination of the subject
cannot be obtained.
• In this case, use the SB-900 off-camera by attaching the optional TTL Remote
Cord as shown below.
• When monitor pre-flashes are fired, distance information from the lens is used
to determine the correct exposure. In this case, position the camera (A) and the
SB-900 (B) at equal distances from the subject.
A
D
Use TTL Remote Code SC-29, SC-28 or SC-17.
t
Setting the aperture in off-camera close-up fl ash operation
• Calculate the aperture by using this equation and table.
• To ensure the correct exposure, use an aperture smaller (larger f-number) than
the one obtained from the equation.
ISO sensitivity
Factor (m/ft)
f/stop ≥ Factor ÷ Flash-to-subject distance
• For example, at an ISO sensitivity of 100 with a subject 0.5 m (1.6 ft.) away and
the wide-flash adapter in place, the suggested aperture is:
f/stop ≥ 2 ÷ 0.5 = 4 (in meters)
f/stop ≥ 6.6 ÷ 1.6 = approx. 4 (in feet)
v
Notes on using a wideangle lens
• Generally, when using a wideangle lens, the distance between the
camera and subject differs from the center of the frame to the periphery,
so the peripheral area might not be sufficiently lit in some cases.
D–32
B
100 200
2/6.6 2.8/9.2
400 800 1600
4/13 5.6/18 8/26.2
3200 6400
11/36 16/52.5