Guide number table, H –18, Tips on speedlight care and reference information – Nikon SB-910 User Manual
Page 129
H–18
H
Tips on Speedlight Care and Reference Information
Guide number table
The SB-910 guide numbers differ depending on the camera’s image area,
illumination pattern, ISO sensitivity, zoom head position and fl ash output level.
ISO 100; m
Zoom head position
(mm)
FX format
DX format
Standard
illumination
Even
illumination
Center-weighted
illumination
Standard
illumination
Even
illumination
Center-weighted
illumination
8 (BA+WP)
–
–
–
–
–
13
8 (BA)
–
–
–
–
–
16
8 (WP)
–
–
–
–
–
17
10 (BA+WP)
–
–
–
13
–
–
10 (BA)
–
–
–
16
–
–
10 (WP)
–
–
–
17
–
–
11 (BA+WP)
–
–
–
–
13
–
11 (BA)
–
–
–
–
16
–
11 (WP)
–
–
–
–
17
–
12 (BA+WP)
–
–
13
–
–
–
12 (BA)
–
–
16
–
–
–
12 (WP)
–
–
17
–
–
–
12
–
–
–
23
–
26
14 (BA+WP)
13
–
–
–
–
–
14 (BA)
16
–
–
–
–
–
14 (WP)
17
–
–
–
–
–
14
–
–
–
25
–
29
16
–
–
–
27
22
32
17 (BA+WP)
–
13
–
–
–
–
17 (BA)
–
16
–
–
–
–
17 (WP)
–
17
–
–
–
–
17
22
–
25
29
23
33
18
23
–
26
30
24
34
20
24
–
27
31
25
36
24
27
22
32
34
32
39
28
30
24
36
36
33
42.5
35
34
31
39
40
37
46
50
40
36
45
45
43
49.5
70
44
41
49
49
47
52
85
46
44
51.5
50.5
49
54.5
105
49
47
52
51.5
50
−
120
50.5
48
53.5
52
51
−
135
51
49
54.5
53
51.5
−
180
52
51
−
53.5
52
−
200
53
51.5
−
54
52.5
−
BA: With the Nikon Diffusion Dome attached
WP: With the built-in wide panel in place