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Guide number table (in DX format)
■
Standard illumination pattern, at ISO 100; m/ft.
Flash
10
output
WP
level
BA
+BA
10/
14/
1/1
32.8
45.9
7.1/
9.9/
1/2
23.3
32.5
5/
7/
1/4
16.4
23
3.5/
4.9/
1/8
11.5
16.1
2.5/
3.5/
1/16
8.2
11.5
1.8/
2.5/
1/32
5.9
8.2
1.3/
1.8/
1/64
4.3
5.9
0.9/
1.2/
1/128
3
3.9
BA: With the Nikon Diffusion Dome attached
WP: With the built-in wide panel in place
Zoom head position (mm)
16
17
18
WP
14/
23/
23.5/
24.5/
45.9
75.5
77.1
80.4
9.9/
16.3/
17/
17.7/
32.5
53.5
55.8
58.1
7/
11.5/
12/
12.5/
23
37.7
39.4
41
4.9/
8.1/
8.5/
8.8/
16.1
26.6
27.9
28.9
3.5/
5.8/
6/
6.3/
11.5
19
19.7
20.7
2.5/
4.1/
4.2/
4.4/
8.2
13.5
13.8
14.4
1.8/
2.9/
3/
3.1/
5.9
9.5
9.8
10.2
1.2/
2/
2.1/
2.2/
3.9
6.6
6.9
7.2
20
24
28
35
26/
28/
29/
31.5/
85.3
91.9
95.1
103.3
18.7/
19.8/
20.5/
21.9/
61.4
65
67.3
71.8
13.3/
14/
14.5/
15.5/
43.6
45.9
47.6
50.9
9.4/
9.9/
10.3/
11/
30.8
32.5
33.8
36.1
6.6/
7/
7.3/
7.8/
21.7
23
23.9
25.6
4.7/
4.9/
5.1/
5.5/
15.4
16.1
16.7
18
3.3/
3.5/
3.6/
3.9/
10.8
11.5
11.8
12.8
2.3/
2.5/
2.6/
2.7/
7.5
8.2
8.5
8.9
50
70
85
34.5/
37/
38/
113.2
121.4
124.7
24/
26.2/
26.9/
78.7
86
88.3
17/
18.5/
19/
55.8
60.7
62.3
12/
13.1/
13.4/
39.4
43
44
8.5/
9.3/
9.5/
27.9
30.5
31.2
6/
6.5/
6.7/
19.7
21.3
22
4.3/
4.6/
4.8/
14.1
15.1
15.7
3/
3.3/
3.4/
9.8
10.8
11.2
H
H–24
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