Panasonic Lumix DMW-FL580L Manuel D'utilisation page 20

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