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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
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