Nikon Speedlight SB-600 - Manual (Page 76)

Use the guide number table and equation to calculate the farthest
flash shooting distance, according to each zoom-head position.
D (farthest flash shooting distance)
= Guide number ÷ f/stop (aperture)
Guide number (m/ft.) in the 1/300 TTL High-Speed Flash
sync mode
ISO Zoom-head position (mm)
sensitivity 14* 24 28 35 50 70 85
25 2.9/9.5 4.7/15 5.1/17 5.6/18 6.6/22 7.3/24 8/26
50 4.0/13 6.7/22 7.2/24 8/26 9.3/31 10.3/34 11.4/37
100 5.7/19 9.4/31 10.1/33 11.3/37 13.1/43 14.5/48 16/52
200 8/26 13.2/43 14.1/46 15.8/52 18.3/60 20/66 22.4/73
400 11.4/37 18.8/62 20.2/66 22.6/74 26.2/86 29/95 32/105
800 16/52 26.3/86 28.3/93 31.6/104 36.7/120 40.6/133 44.8/147
*With the wide-flash adapter in place
• For example, when shooting with an ISO sensitivity of 100, at a 35mm
zoom-head position and an aperture of f/5.6:
D = 11.3 ÷ 5.6 (f/stop) = 2.0 (in meters)
(farthest flash shooting distance)
D = 37 ÷ 5.6 (f/stop) = 6.6 (in feet)
(farthest flash shooting distance)
76
Flash shooting in the 1/300 TTL
High-Speed Flash sync mode (F5 only)