Univex SB-900 user manual Taking close-upphotographs with bounce-downflash, D–32

Taking close-up photographs with bounce-down flash

tWhen 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

B

D

Flash modes and functions

Use TTL Remote Code SC-29, SC-28 or SC-17.

tSetting the aperture in off-camera close-up flash 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	100	200	400	800	1600	3200	6400
Factor (m/ft)	2/6.6	2.8/9.2	4/13	5.6/18	8/26.2	8/26.2	16/52.5

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)

vNotes 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.

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