Nikon Speedlite SB-800 - Manual (Page 112)

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• The farthest flash shooting distance cannot be read on the
SB-800’s LCD panel. In this case, use the guide number table
and equation for calculating this 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
∗1 With the Nikon Diffusion Dome attached and the wide-flash adapter in
place
∗2 With the Nikon Diffusion Dome attached
∗3 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 = 14 ÷ 5.6 (f/stop) = 2.5 (in meters)
(farthest flash shooting distance)
D = 46 ÷ 5.6 (f/stop) = 8.2 (in feet)
(farthest flash shooting distance)
Flash shooting in the 1/300 TTL
High-Speed Flash sync mode (F5 only)
ISO
Zoom-head position (mm)
sensitivity ∗
1
∗
2 14
∗3
17
∗3
24 28 35 50 70 85 105
25 2.5/8 3/10 3.5/11 3.5/11 5.5/18 6/20 7/23 8/26 9/30 9.5/31 10/33
50 3.6/12 4.3/14 5/16 5/16 7.8/26 8.5/28 9.9/32 11.4/37 12.8/42 13.5/44 14.2/47
100 5/16 6/20 7/23 7/23 11/36 12/39 14/46 16/52 18/59 19/62 20/66
200 7/23 8.4/28 9.8/32 9.8/32 15.4/51 16.8/55 19.6/64 22.4/73 25.2/83 26.6/87 28/92
400 10/33 12/39 14/46 14/46 22/72 24/79 28/92 32/105 36/118 38/125 40/131
800 14/46 16.8/55 19.6/64 19.6/64 30.8/101 33.6/110 39.2/129 44.8/147 50.4/165 53.2/174 56/184