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■ Guide Number (GN)
Guide numbers indicate flash light intensity.
The larger the number, the farther you can reach
with your flash. From the guide number, you can
easily obtain the proper aperture setting required
for an optimum exposure.
Aperture (f/stop) =
Guide Number Table
Camera format
Flash light
ISO
intensity
1/1
1/2
1/4
ISO100
1/8
1/16
1/32
1/64
GN
Subject distance
DIGITAL
58mm
54
38
27
19
13.5
9.5
6.7
●Depending on the camera and lens you are
using, the effective flash range may be dis-
played.
* With the wide-angle panel attached
Zoom position
48mm
34mm
24mm
50
45
39
35
32
27.5
24.5
22.5
19.5
17
16
13.5
12
11
9.5
8.5
8
6.5
6
5.6
4.6
19mm
16mm
*13mm
35
32
21
24.5
22.5
14.5
17
16
10
12
11
8.5
7.5
6
5
3.5
4.2
3.5
2.4
7
5
59
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