Addi ti o na l i nforma ti o n 51, Iso speed coefficient – Sony HVL-F42AM User Manual
Page 51
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Addi
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APS-C format (ISO100)
ISO speed coefficient
Photography distance range = Guide number × ISO speed coefficient
÷ Aperture
Ex) When using an APS-C format camera, shutter speed: 1/500 second, focal
length: 28 mm, aperture: F2.8, ISO: 400
7.1 (Guide number) × 2 (ISO speed coefficient) ÷ 2.8 (Aperture) = 5 m
The flash light reaches to 5 m.
Shutter speed
Flash Coverage Settings (mm)
16*
24
28
35
50
70
105
1/250
4.7
9.7
10.0
10.9
13.4
15.0
16.4
1/500
3.3
6.8
7.1
7.7
9.5
10.6
11.6
1/1000
2.4
4.8
5.0
5.5
6.7
7.5
8.2
1/2000
1.7
3.4
3.5
3.9
4.7
5.3
5.8
1/4000
1.2
2.4
2.5
2.7
3.4
3.8
4.1
1/8000
0.8
1.7
1.8
1.9
2.4
2.7
2.9
1/12000
0.6
1.2
1.3
1.4
1.7
1.9
2.1
* When the wide panel is attached.
ISO100
ISO200
ISO400
ISO800
ISO1600
ISO3200
1
1.4
2
2.8
4
5.7
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