30
31
GUIDE NUMBER (GN) LIST
FOUR THIRDS
8
10
12
14
17
25
35
42
135F
16
20
24
28
35
50
70
85
Full emission
18.0
20.0
28.0
30.0
36.0
40.0
45.0
50.0
ZOOM (mm)
ISO100, m
TTL AUTO/AUTO
• TTL AUTO/AUTO
FOUR THIRDS
8
10
12
14
17
25
35
42
135F
16
20
24
28
35
50
70
85
1/1
18.0
20.0
28.0
30.0
36.0
40.0
45.0
50.0
1/2
12.7
14.1
19.8
21.2
25.5
28.3
31.8
35.4
1/4
9.0
10.0
14.0
15.0
18.0
20.0
22.5
25.0
1/8
6.4
7.1
9.9
10.6
12.7
14.1
15.9
17.7
1/16
4.5
5.0
7.0
7.5
9.0
10.0
11.3
12.5
1/32
3.2
3.5
4.9
5.3
6.4
7.1
8.0
8.8
1/64
2.3
2.5
3.5
3.8
4.5
5.0
5.6
6.3
1/128
1.6
1.8
2.5
2.7
3.2
3.5
4.0
4.4
1/256
1.1
1.3
1.8
1.9
2.3
2.5
2.8
3.1
ZOOM (mm)
ISO100, m
MANUAL
• MANUAL
FOUR THIRDS
8
10
12
14
17
25
35
42
135F
16
20
24
28
35
50
70
85
1/125
12.7
14.1
19.8
21.2
25.5
28.3
31.8
35.4
1/160
11.3
12.6
17.6
18.9
22.7
25.2
28.3
31.5
1/200
10.1
11.2
15.7
16.8
20.2
22.5
25.2
28.1
1/250
9.0
10.0
14.0
15.0
18.0
20.0
22.5
25.0
1/320
8.0
8.9
12.5
13.4
16.1
17.8
20.0
22.3
1/400
7.1
7.9
11.1
11.9
14.3
15.9
17.8
19.9
1/500
6.4
7.1
9.9
10.6
12.8
14.2
15.9
17.7
1/640
5.7
6.3
8.8
9.4
11.4
12.6
14.2
15.8
1/800
5.0
5.6
7.9
8.4
10.1
11.2
12.6
14.0
1/1000
4.5
5.0
7.0
7.5
9.0
10.0
11.2
12.5
1/1250
4.0
4.4
6.2
6.7
8.0
8.9
10.0
11.2
1/1600
3.6
4.0
5.6
5.9
7.2
7.9
8.9
9.9
1/2000
3.2
3.5
5.0
5.3
6.4
7.1
8.0
8.9
1/2500
2.8
3.1
4.4
4.7
5.7
6.3
7.1
7.9
1/3200
2.5
2.8
3.9
4.2
5.1
5.6
6.3
7.0
1/4000
2.2
2.5
3.5
3.7
4.5
5.0
5.6
6.3
1/5000
2.0
2.2
3.1
3.3
4.0
4.5
5.0
5.6
1/6400
1.8
2.0
2.8
3.0
3.6
4.0
4.5
5.0
1/8000
1.6
1.8
2.5
2.7
3.2
3.5
4.0
4.4
ZOOM (mm)
ISO100, m
Shutter speed
• FP TTL AUTO
FOUR THIRDS
8
10
12
14
17
25
35
42
135F
16
20
24
28
35
50
70
85
1/125
12.7
14.1
19.8
21.2
25.5
28.3
31.8
35.4
1/160
11.3
12.6
17.6
18.9
22.7
25.2
28.3
31.5
1/200
10.1
11.2
15.7
16.8
20.2
22.5
25.2
28.1
1/250
9.0
10.0
14.0
15.0
18.0
20.0
22.5
25.0
1/320
8.0
8.9
12.5
13.4
16.1
17.8
20.0
22.3
1/400
7.1
7.9
11.1
11.9
14.3
15.9
17.8
19.9
1/500
6.4
7.1
9.9
10.6
12.8
14.2
15.9
17.7
1/640
5.7
6.3
8.8
9.4
11.4
12.6
14.2
15.8
1/800
5.0
5.6
7.9
8.4
10.1
11.2
12.6
14.0
1/1000
4.5
5.0
7.0
7.5
9.0
10.0
11.2
12.5
1/1250
4.0
4.4
6.2
6.7
8.0
8.9
10.0
11.2
1/1600
3.6
4.0
5.6
5.9
7.2
7.9
8.9
9.9
1/2000
3.2
3.5
5.0
5.3
6.4
7.1
8.0
8.9
1/2500
2.8
3.1
4.4
4.7
5.7
6.3
7.1
7.9
1/3200
2.5
2.8
3.9
4.2
5.1
5.6
6.3
7.0
1/4000
2.2
2.5
3.5
3.7
4.5
5.0
5.6
6.3
1/5000
2.0
2.2
3.1
3.3
4.0
4.5
5.0
5.6
1/6400
1.8
2.0
2.8
3.0
3.6
4.0
4.5
5.0
1/8000
1.6
1.8
2.5
2.7
3.2
3.5
4.0
4.4
ZOOM
(mm)
ISO100, m
Shutter speed
• FP MANUAL
The following guide number (GN) figures have a 1/1 light intensity ratio.
Light intensity ratio
1/1
1/2
1/4
1/8
1/16
Coefficient
1.0
0.71
0.5
0.35
0.25
The guide numbers (GN) for light intensity ratios other than 1/1 in the FP MANUAL mode
can be calculated with the following formula.
Guide number (GN) = GN at 1/1 x Light intensity ratio coefficient
Light intensity ratios and their coefficients
Summary of Contents for FL 50 - Hot-shoe clip-on Flash
Page 1: ......
