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GUIDE NUMBER (GN) LIST
• TTL AUTO/AUTO
FOUR THIRDS
8
ZOOM (mm)
With 135
16
TTL AUTO/AUTO
Full emission
18
• MANUAL
FOUR THIRDS
8
ZOOM (mm)
With 135
16
1/1
18
1/2
13
1/4
9.0
1/8
6.4
MANUAL
1/16
4.5
1/32
3.2
1/64
2.3
1/128
1.6
• FP TTL AUTO
FOUR THIRDS
8
ZOOM (mm)
With 135
16
1/125
13
1/160
11
1/200
10
1/250
9.0
1/320
8.0
1/400
7.1
1/500
6.4
1/640
5.7
1/800
5.0
Shutter speed
1/1000
4.5
1/1250
4.0
1/1600
3.6
1/2000
3.2
1/2500
2.8
1/3200
2.5
1/4000
2.2
1/5000
2.0
1/6400
1.8
1/8000
1.6
64
ISO100, m
10
12
14
17
25
35
20
24
28
35
50
70
20
28
30
36
40
45
ISO100, m
10
12
14
17
25
35
20
24
28
35
50
70
20
28
30
36
40
45
14
20
21
26
28
32
10
14
15
18
20
23
7.1
9.9
11
13
14
16
5.0
7.0
7.5
9.0
10
11
3.5
4.9
5.3
6.4
7.1
8.0
2.5
3.5
3.8
4.5
5.0
5.6
1.8
2.5
2.7
3.2
3.5
4.0
ISO100, m
10
12
14
17
25
35
20
24
28
35
50
70
14
20
21
26
28
32
13
18
19
23
25
28
11
16
17
20
23
25
10
14
15
18
20
23
8.9
13
13
16
18
20
7.9
11
12
14
16
18
7.1
9.9
11
13
14
16
6.3
8.8
9.4
11
13
14
5.6
7.9
8.4
10
11
13
5.0
7.0
7.5
9.0
10
11
4.4
6.2
6.7
8.0
8.9
10
4.0
5.6
5.9
7.2
7.9
8.9
3.5
5.0
5.3
6.4
7.1
8.0
3.1
4.4
4.7
5.7
6.3
7.1
2.8
3.9
4.2
5.1
5.6
6.3
2.5
3.5
3.7
4.5
5.0
5.6
2.2
3.1
3.3
4.0
4.5
5.0
2.0
2.8
3.0
3.6
4.0
4.5
1.8
2.5
2.7
3.2
3.5
4.0
• FP MANUAL
The following guide number (GN) figures have a 1/1 light intensity ratio.
FOUR THIRDS
ZOOM (mm)
42
85
50
42
85
50
35
Shutter speed
25
18
13
8.8
6.3
4.4
42
85
The guide numbers (GN) for light intensity ratios other than 1/1 in the FP MANUAL mode
35
can be calculated with the following formula.
32
28
25
22
Light intensity ratios and their coefficients
20
18
16
14
13
11
9.9
8.9
7.9
7.0
6.3
5.6
5.0
4.4
8
10
12
14
With 135
16
20
24
28
1/125
13
14
20
21
1/160
11
13
18
19
1/200
10
11
16
17
1/250
9.0
10
14
15
1/320
8.0
8.9
13
13
1/400
7.1
7.9
11
12
1/500
6.4
7.1
9.9
11
1/640
5.7
6.3
8.8
9.4
1/800
5.0
5.6
7.9
8.4
1/1000
4.5
5.0
7.0
7.5
1/1250
4.0
4.4
6.2
6.7
1/1600
3.6
4.0
5.6
5.9
1/2000
3.2
3.5
5.0
5.3
1/2500
2.8
3.1
4.4
4.7
1/3200
2.5
2.8
3.9
4.2
1/4000
2.2
2.5
3.5
3.7
1/5000
2.0
2.2
3.1
3.3
1/6400
1.8
2.0
2.8
3.0
1/8000
1.6
1.8
2.5
2.7
Guide number (GN) = Guide number at 1/1 x Light intensity ratio coefficient
Light intensity ratio
1/1
1/2
1/4
Coefficient
1.0
0.71
0.5
ISO100, m
17
25
35
42
35
50
70
85
26
28
32
35
23
25
28
32
20
23
25
28
18
20
23
25
16
18
20
22
14
16
18
20
13
14
16
18
11
13
14
16
10
11
13
14
9.0
10
11
13
8.0
8.9
10
11
7.2
7.9
8.9
9.9
6.4
7.1
8.0
8.9
5.7
6.3
7.1
7.9
5.1
5.6
6.3
7.0
4.5
5.0
5.6
6.3
4.0
4.5
5.0
5.6
3.6
4.0
4.5
5.0
3.2
3.5
4.0
4.4
1/8
1/16
0.35
0.25
65
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