Sony HVL-F42AM Operating Instructions Manual page 51

APS-C format (ISO100)
Shutter speed
1/250
1/500
1/1000
1/2000
1/4000
1/8000
1/12000
* When the wide panel is attached.
ISO speed coefficient
ISO100 ISO200
1
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.
16* 24
4.7 9.7
3.3 6.8
2.4 4.8
1.7 3.4
1.2 2.4
0.8 1.7
0.6 1.2
ISO400
1.4 2
Flash Coverage Settings (mm)
28 35
10.0 10.9
7.1 7.7
5.0 5.5
3.5 3.9
2.5 2.7
1.8 1.9
1.3 1.4
ISO800
2.8
50 70 105
13.4 15.0 16.4
9.5 10.6 11.6
6.7 7.5
4.7 5.3
3.4 3.8
2.4 2.7
1.7 1.9
ISO1600 ISO3200
4 5.7
8.2
5.8
4.1
2.9
2.1
51
GB