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Shutter
speed
1/125
1/160
1/200
1/250
1/320
1/400
1/500
1/640
1/800
1/1000
1/1300
1/1600
1/2000
1/2500
1/3200
1/4000
1/5000
1/6400
1/8000
¢2 Multiplying these lighting angles (mm) by two yields equivalent values for
35 mm films.
≥ In the [FP MANUAL] mode, the following formula can be used to obtain the guide
numbers (GN) when any setting except 1/1 is used for the light quantity.
Guide number (GN) = Guide number for 1/1
¢3
coefficient
¢3 Light quantity ratio coefficient
Light quantity ratio
Light quantity ratio
coefficient
≥ The values in the table assume that the ISO sensitivity is set to [100].
20
VQT5F44
¢2
¢2
25
35
32
35
28
31
25
28
23
25
20
22
18
20
16
18
14
16
13
14
11
13
10
11
8.9
9.9
8.0
8.9
7.1
7.9
6.3
7.0
5.6
6.3
5.0
5.6
4.4
4.9
4.0
4.4
1/1
1.0
Lighting angle (mm)
¢2
¢2
42
52
38
39
33
35
30
31
27
28
24
25
21
22
19
19
17
17
15
15
13
14
12
12
11
11
9.4
9.7
8.3
8.6
7.5
7.7
6.6
6.9
5.9
6.2
5.2
5.4
4.7
4.9
k
1/2
0.71
¢2
67
100
40
41
35
36
31
32
28
29
25
26
22
23
20
21
18
18
16
16
14
14
12
13
11
11
9.9
10
8.8
9.1
7.9
8.2
7.0
7.2
6.3
6.5
5.5
5.7
5.0
5.1
light quantity ratio
1/4
1/8
0.5
0.35
¢2
1/16
0.25
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