Nikon SB 800 Instruction Manual - Page 112

Flash shooting in the 1/300 TTL, High-Speed Flash sync mode F5 only

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Flash shooting in the 1/300 TTL High-Speed Flash sync mode (F5 only) • 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 ISO sensitivity ∗1 25 2.5/8 50 3.6/12 100 5/16 200 7/23 400 10/33 800 14/46 Zoom-head position (mm) ∗2 14∗3 17∗3 24 28 35 50 70 85 105 3/10 3.5/11 3.5/11 5.5/18 6/20 7/23 8/26 9/30 9.5/31 10/33 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 6/20 7/23 7/23 11/36 12/39 14/46 16/52 18/59 19/62 20/66 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 12/39 14/46 14/46 22/72 24/79 28/92 32/105 36/118 38/125 40/131 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 ∗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) 106

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106
• 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