Nikon D90 - Manual (Page 254)

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❚❚CLS-Compatible Flash Units
The D90 can be used with the following CLS-compatible flash units: the SB-900,
SB-800, SB-600, SB-400, SB-R200, and SU-800.
The SB-900, SB-800, SB-600, SB-400, and SB-R200
The principal features of these flash units are listed below.
SU-800 Wireless Speedlight Commander
When mounted on a CLS-compatible camera, the SU-800 can be used as a
commander for remote SB-900, SB-800, SB-600, or SB-R200 flash units. The SU-800
itself is not equipped with a flash.
D Use Only Nikon Flash Accessories
Use only Nikon flash units. Negative voltages or voltages over 250 V applied to the accessory
shoe could not only prevent normal operation, but damage the sync circuitry of the camera or
flash. Before using a Nikon flash unit not listed in this section, contact a Nikon-authorized
service representative for more information.
A Guide Number
To calculate the range of the flash at full power, divide the Guide Number by the aperture. For
example, at ISO 100 the SB-800 has a Guide Number of 38 m or 125 ft. (35 mm zoom head
position); its range at an aperture of f/5.6 is 38÷5.6 or about 6.8 meters (or in feet,
125÷5.6=approximately 23 ft. 7 in.). For each twofold increase in ISO sensitivity, multiply the
Guide Number by the square root of two (approximately 1.4).
Flash unit
SB-900 1 SB-800 SB-600 SB-400 SB-R200 2 Feature
Guide No. 3
ISO 100 34/111 38/125 30/98 21/69 10/32
ISO 200 48/157 53/175 42/138 30/98 14/49
Auto power zoom (mm) 17–200 24–105 24–85 — 4 — 5
Wide panel (mm) 12, 14, 17 14, 17 14 — —
Head rotation
7 ° down, 90 ° up,
180 ° left/right
7 ° down, 90 ° up,
180 ° left,
90 ° right
90 ° up, 180 ° left,
90 ° right
90 ° up
60 ° down (toward
lens light axis),
45 ° up (away from
light axis)
1 If a color filter is attached to the SB-900 when AUTO or N (flash) is selected for white balance, the camera
will automatically detect the filter and adjust white balance appropriately.
2 Controlled remotely with built-in flash in commander mode or using optional SB-900, SB-800 flash unit
or SU-800 wireless Speedlight commander.
3 m/ft., 20 °C (68 °F), SB-900, SB-800 and SB-600 at 35 mm zoom head position; SB-900 with standard
illumination.
4 27 mm zoom coverage.
5 24 mm zoom coverage.