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