VQT5F44
20
¢
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
k
light quantity ratio
coefficient
¢
3
¢
3
Light quantity ratio coefficient
≥
The values in the table assume that the ISO sensitivity is set to [100].
Shutter
speed
Lighting angle (mm)
25
¢
2
35
¢
2
42
¢
2
52
¢
2
67
¢
2
100
¢
2
1/125
32
35
38
39
40
41
1/160
28
31
33
35
35
36
1/200
25
28
30
31
31
32
1/250
23
25
27
28
28
29
1/320
20
22
24
25
25
26
1/400
18
20
21
22
22
23
1/500
16
18
19
19
20
21
1/640
14
16
17
17
18
18
1/800
13
14
15
15
16
16
1/1000
11
13
13
14
14
14
1/1300
10
11
12
12
12
13
1/1600
8.9
9.9
11
11
11
11
1/2000
8.0
8.9
9.4
9.7
9.9
10
1/2500
7.1
7.9
8.3
8.6
8.8
9.1
1/3200
6.3
7.0
7.5
7.7
7.9
8.2
1/4000
5.6
6.3
6.6
6.9
7.0
7.2
1/5000
5.0
5.6
5.9
6.2
6.3
6.5
1/6400
4.4
4.9
5.2
5.4
5.5
5.7
1/8000
4.0
4.4
4.7
4.9
5.0
5.1
Light quantity ratio
1/1
1/2
1/4
1/8
1/16
Light quantity ratio
coefficient
1.0
0.71
0.5
0.35
0.25
VQT5F44_ENG.fm 20 ページ ２０１４年２月１７日 月曜日 午後２時２２分
