Nikon D40 Optional Flash Units Speedlights, SB-400, SB-800, and SB-600 Speedlights, Guide Number

Optional Flash Units (Speedlights)

The accessory shoe allows SB-series Speedlights, including the SB- 400, 800, 600, 80DX, 28DX, 28, 27, 23, 22S, and 29S to be mounted directly on the camera without a sync cable. It is equipped with a safety lock for Speedlights with a locking pin, such as the SB-800 and SB-600. Before attaching an optional flash unit, remove the accessory shoe cover. The built-in flash will not fire when an optional Speedlight is attached.

When used with compatible flash units such as the optional SB-400, SB-800, and SB-600 Speedlights or SB-R200 wireless remote Speedlight, the D40 supports the advanced Nikon Creative Lighting System (CLS), including i-TTL flash control and Flash Color Information Communication. See the Speedlight manual for details.

SB-400, SB-800, and SB-600 Speedlights

These high-performance Speedlights have Guide Numbers of 30/98 (18-mm zoom cover- age), 53/174 (35-mm zoom head position), and 42/138 (35-mm zoom head position) respectively (m/ft, ISO 200, 20°C/68°F; GNs at ISO 100 are 21/69, 38/125, and 30/98 respec- tively). The flash head can be rotated through 90° above the horizontal for bounce-flash or close-up photography. The SB-800 and SB-600 can also be rotated 180° left and 90° right, and the SB-800 can be rotated 7° below the horizontal. The SB-800 and SB-600 support auto power zoom (24–105mm and 24–85mm, respectively), ensuring that the illuminating angle is adjusted in accord with lens focal length and have both a built-in wide panel that can be used for an angle of 14mm (the SB-800 also supports 17mm) and an illuminator that can be used when adjusting settings in the dark.

SB-R200 Wireless Remote Speedlight

This high-performance wireless remote Speedlight has a Guide Number of 14/49 (m/ft, ISO 200, 20°C/68°F; GN at ISO 100 is 10/32). Although it can not be mounted directly on the accessory shoe, it can be controlled using an optional SB-800 Speedlight or SU-800 wireless Speedlight commander. The SB-R200 can be hand-held, placed on an AS-20 Speedlight stand, or mounted on the camera lens using the SX-1 attachment for remote control and close-up i-TTL photography.

SU-800 Wireless Speedlight Commander

The SU-800 can be used as a commander for remote SB-800, 600, or R200 flash units. The SU-800 itself is not equipped with a flash.

Guide Number

To calculate the range of the flash at full power, divide the Guide Number by the aperture. For exam- ple, at ISO 200 the SB-400 has a Guide Number of 30m or 98ft.; its range at an aperture of f/5.6 is 30÷5.6 or about 5.3 meters (or in feet, 98÷5.6=17ft. 6in.). For each twofold increase in ISO sensitivity, multiply the Guide Number by the square root of two (approximately 1.4).

Technical Notes/Optional Accessories

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