Nikon D7100 The Nikon Creative Lighting System (CLS), SU-800, ❚❚CLS-CompatibleFlash Units, •The SB-910, SB-900, SB-800, SB-700, SB-600, SB-400,and SB-R200:

The Nikon Creative Lighting System (CLS)

Nikon’s advanced Creative Lighting System (CLS) offers improved communication between the camera and compatible flash units for improved flash photography. Refer to the documentation provided with the flash unit for details.

❚❚CLS-Compatible Flash Units

The camera can be used with the following CLS-compatible flash units:

•The SB-910, SB-900, SB-800, SB-700, SB-600, SB-400, and SB-R200:

	Flash unit
Feature		SB-910 1	SB-900 1	SB-800	SB-700 1	SB-600	SB-400 2	SB-R200 3
Guide No. 4	ISO 100	34/111	34/111	38/125	28/92	30/98	21/69	10/33
	ISO 200	48/157	48/157	53/174	39/128	42/138	30/98	14/46

1If a color filter is attached to the SB-910, SB-900, or SB-700 when vor N(flash) is selected for white balance, the camera will automatically detect the filter and adjust white balance appropriately.

2 Wireless flash control is not available with the SB-400.

3Controlled remotely with built-in flash in commander mode or using optional SB-910, SB-900, SB-800, or SB-700 flash unit or SU-800 wireless Speedlight commander.

4m/ft, 20 °C (68 °F), SB-910, SB-900, SB-800, SB-700, and SB-600 at 35 mm zoom head position; SB-910, SB-900, and SB-700 with standard illumination.

•SU-800 Wireless Speedlight Commander: When mounted on a CLS-compatible camera, the SU-800 can be used as a commander for remote SB-910,SB-900,SB-800,SB-700,SB-600, or SB-R200 flash units in up to three groups. The SU-800 itself is not equipped with a flash.

	A Guide Number
	To calculate the range of the flash at full power, divide the Guide Number by the aperture. If,
	for example, the flash unit has a Guide Number of 34 m or 111 ft (ISO 100, 20 °C/68 °F); its
	range at an aperture of f/5.6 is 34÷5.6 or about 6.1 meters (or in feet,
	111÷5.6=approximately 19 ft 10 in.). For each twofold increase in ISO sensitivity, multiply
n
	the Guide Number by the square root of two (approximately 1.4).

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