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GUIDE NUMBER (GN) LIST
• TTL AUTO/AUTO
FOUR THIRDS
8
ZOOM (mm)
135F
16
Full emission
18.0
TTL AUTO/AUTO
• MANUAL
FOUR THIRDS
8
ZOOM (mm)
135F
16
1/1
18.0
1/2
12.7
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
1/256
1.1
• FP TTL AUTO
FOUR THIRDS
8
ZOOM (mm)
135F
16
1/125
12.7
1/160
11.3
1/200
10.1
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
30
10
12
14
17
25
35
20
24
28
35
50
70
20.0
28.0
30.0
36.0
40.0
45.0
10
12
14
17
25
35
20
24
28
35
50
70
20.0
28.0
30.0
36.0
40.0
45.0
14.1
19.8
21.2
25.5
28.3
31.8
10.0
14.0
15.0
18.0
20.0
22.5
7.1
9.9
10.6
12.7
14.1
15.9
5.0
7.0
7.5
9.0
10.0
11.3
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
1.3
1.8
1.9
2.3
2.5
2.8
10
12
14
17
25
35
20
24
28
35
50
70
14.1
19.8
21.2
25.5
28.3
31.8
12.6
17.6
18.9
22.7
25.2
28.3
11.2
15.7
16.8
20.2
22.5
25.2
10.0
14.0
15.0
18.0
20.0
22.5
8.9
12.5
13.4
16.1
17.8
20.0
7.9
11.1
11.9
14.3
15.9
17.8
7.1
9.9
10.6
12.8
14.2
15.9
6.3
8.8
9.4
11.4
12.6
14.2
5.6
7.9
8.4
10.1
11.2
12.6
5.0
7.0
7.5
9.0
10.0
11.2
4.4
6.2
6.7
8.0
8.9
10.0
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.
ISO100, m
ZOOM (mm)
42
85
50.0
ISO100, m
42
85
50.0
35.4
Shutter speed
25.0
17.7
12.5
8.8
6.3
4.4
3.1
ISO100, m
42
The guide numbers (GN) for light intensity ratios other than 1/1 in the FP MANUAL mode
85
can be calculated with the following formula.
35.4
31.5
28.1
25.0
Light intensity ratios and their coefficients
22.3
19.9
17.7
15.8
14.0
12.5
11.2
9.9
8.9
7.9
7.0
6.3
5.6
5.0
4.4
FOUR THIRDS
8
10
12
14
135F
16
20
24
28
1/125
12.7
14.1
19.8
21.2
1/160
11.3
12.6
17.6
18.9
1/200
10.1
11.2
15.7
16.8
1/250
9.0
10.0
14.0
15.0
1/320
8.0
8.9
12.5
13.4
1/400
7.1
7.9
11.1
11.9
1/500
6.4
7.1
9.9
10.6
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) = GN 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
25.5
28.3
31.8
35.4
22.7
25.2
28.3
31.5
20.2
22.5
25.2
28.1
18.0
20.0
22.5
25.0
16.1
17.8
20.0
22.3
14.3
15.9
17.8
19.9
12.8
14.2
15.9
17.7
11.4
12.6
14.2
15.8
10.1
11.2
12.6
14.0
9.0
10.0
11.2
12.5
8.0
8.9
10.0
11.2
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
31
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