Nikon Speedlight SB-600 User Manual download pdf (Page 35)

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Determining the aperture and flash output level in the

Manual mode

In the Manual mode, use the guide number table and the following equation to

calculate the aperture, flash output level and shooting distance to obtain the

correct exposure.

• The guide number (GN at ISO 100; m/ft) indicates the amount of light generated by the

flash. The larger the number, the greater the flash output.

Guide number (ISO 100, m/ft)

Flash output

Zoom-head position (mm)

level

14* 24 28 35 50 70 85

M1/1 14.0/45.9 26.0/85.3 28.0/91.9 30.0/98.4 36.0/118.1 38.0/124.7 40.0/131.2

M1/2 9.9/32.5 18.4/60.4 19.8/65.0 21.2/69.6 25.5/83.7 26.9/88.3 28.3/92.8

M1/4 7.0/23.0 13.0/42.7 14.0/45.9 15.0/49.2 18.0/59.1 19.0/62.3 20.0/65.6

M1/8 4.9/16.1 9.2/30.2 9.9/32.5 10.6/34.8 12.7/41.7 13.4/44.0 14.1/46.3

M1/16 3.5/11.5 6.5/21.3 7.0/23.0 7.5/24.6 9.0/29.5 9.5/31.2 10.0/32.8

M1/32 2.5/8.2 4.6/15.1 4.9/16.1 5.3/17.4 6.4/21.0 6.7/22.0 7.1/23.3

M1/64 1.8/5.9 3.3/10.8 3.5/11.5 3.8/12.5 4.5/14.8 4.8/15.7 5.0/16.4

* With the wide-flash adapter in place

To calculate the correct aperture

Calculate the correct aperture by using this equation and the guide number

table, according to the flash output level, zoom-head position and ISO

sensitivity set on the camera:

• Set this aperture on the camera or lens.

To calculate the guide number

Calculate the guide number by using this equation, according to the shooting

distance and aperture required.

• Referring to the guide number table, determine an appropriate flash output level

corresponding to the guide number obtained above, then set the same value on the SB-600.

ISO sensitivity factors

For sensitivities other than ISO 100, multiply the guide number by the factors

shown in the table below.

ISO 25 50 100 200 400 800 1600

Factors x0.5 x0.71 x1 x1.4 x2 x2.8 x4

Guide number (GN) = Shooting distance (m/ft) x Aperture ÷ ISO sensitivity factor

f/stop (aperture) = guide number (GN) x ISO sensitivity factor ÷ Shooting distance (m/ft)

Detailed operation

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Nikon Speedlight SB-600 User Manual Page 35