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[FP MANUAL]
≥
Listed below are the guide numbers (GN) for 1/1 (FULL) flashes.
Shutter
speed
8
(16)
1/125
8.5
1/160
7.5
1/200
6.7
1/250
6.0
1/320
5.3
1/400
4.7
1/500
4.2
1/640
3.8
1/800
3.4
1/1000
3.0
1/1250
2.7
1/1600
2.4
1/2000
2.1
1/2500
1.9
1/3200
1.7
1/4000
1.5
1/5000
1.3
1/6400
1.2
1/8000
1.1
≥
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
¢
coefficient
¢ Light quantity ratio coefficient
Light quantity ratio
Light quantity ratio coefficient
Lighting angle
Focal length (mm) (35 mm film conversion)
10
12
14
(20)
(24)
(28)
9.9
14.1
15.6
8.8
12.5
13.8
7.8
11.2
12.3
7.0
10.0
11.0
6.2
8.8
9.7
5.5
7.9
8.7
4.9
7.1
7.8
4.4
6.3
6.9
3.9
5.6
6.1
3.5
5.0
5.5
3.1
4.5
4.9
2.8
4.0
4.3
2.5
3.5
3.9
2.2
3.2
3.5
2.0
2.8
3.1
1.8
2.5
2.8
1.6
2.2
2.5
1.4
2.0
2.2
1.2
1.8
1.9
1/1
1.0
17
25
35
(35)
(50)
(70)
17.0
19.8
22.6
15.0
17.5
20.0
13.4
15.7
17.9
12.0
14.0
16.0
10.6
12.4
14.1
9.5
11.1
12.6
8.5
9.9
11.3
7.5
8.8
10.0
6.7
7.8
8.9
6.0
7.0
8.0
5.4
6.3
7.2
4.7
5.5
6.3
4.2
4.9
5.7
3.8
4.4
5.1
3.4
3.9
4.5
3.0
3.5
4.0
2.7
3.1
3.6
2.4
2.8
3.2
2.1
2.5
2.8
k
light quantity ratio
1/2
1/4
1/8
0.71
0.5
0.35
42
(85)
25.5
22.5
20.1
18.0
15.9
14.2
12.7
11.3
10.1
9.0
8.0
7.1
6.4
5.7
5.0
4.5
4.0
3.6
3.2
1/16
0.25
43
VQT1B11
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