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