Pentax AF360FGZ Operation Manual - Page 81

Guide Number GN, Flash, light, intensity, Camera format, Zoom position, 150mm, 135mm, DIGITAL

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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) = GN/flash-to-subject distance (m) ● Depending on the camera and lens you are using, the effective flash range may be displayed. (Refer to page 78.) Guide Number Table *With the wide-angle panel attached ISO ISO100 Flash light intensity Camera format 35mm 645 67 DIGITAL 1/1 1/2 1/4 1/8 1/16 1/32 85mm 150mm 190mm 58mm 36 25 18 12.5 9 6 70mm 135mm 180mm 48mm 33 23 16.5 11.5 8 5.5 Zoom position 50mm 100mm 120mm 34mm 30 21 15 10.5 7.5 5.4 35mm 70mm 90mm 24mm 25 18 12.5 9 6 4.3 28mm 55mm 70mm 19mm 22 16 11 8 5.5 4 24mm 45mm 60mm 16mm 21 15 10.5 7.5 5 3.6 *20mm *35mm *55mm *13mm 14 10 7 5 3.5 2.5 79

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79
■
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.
●
Depending on the camera and lens you are using,
the effective flash range may be displayed. (Refer to
page 78.)
Guide Number Table
*With the wide-angle panel attached
Aperture (f/stop) =
GN/flash-to-subject distance (m)
ISO
Flash
light
intensity
Camera format
Zoom position
35mm
85mm
70mm
50mm
35mm
28mm
24mm
*20mm
645
150mm
135mm
100mm
70mm
55mm
45mm
*35mm
67
190mm
180mm
120mm
90mm
70mm
60mm
*55mm
DIGITAL
58mm
48mm
34mm
24mm
19mm
16mm
*13mm
ISO100
1/1
36
33
30
25
22
21
14
1/2
25
23
21
18
16
15
10
1/4
18
16.5
15
12.5
11
10.5
7
1/8
12.5
11.5
10.5
9
8
7.5
5
1/16
9
8
7.5
6
5.5
5
3.5
1/32
6
5.5
5.4
4.3
4
3.6
2.5