31
VQT1B11
∫
How to determine the guide
number, the aperture and the
optimum camera to subject
distance
When the camera to subject
distance and aperture have been
decided upon
≥
The following formula is used to
obtain the guide number (GN),
which is then set in the unit.
“Aperture (F)”
k
“Camera to subject
distance (m)”
m
“ISO sensitivity
coefficient
¢
”
When the aperture is to be set
≥
The following formula is used to
obtain the aperture, which is then
set in the digital camera.
“Guide number (GN)”
k
“ISO
sensitivity coefficient
¢
”
m
“Camera to
subject distance (m)”
How to obtain the optimum
camera to subject distance
“Guide number (GN)”
k
“ISO
sensitivity coefficient
¢
”
m
“Aperture
(F)”
¢
ISO sensitivity coefficient
≥
For a list of guide numbers (GN),
turn to P41.
ISO sensitivity
Compensation
coefficient
3200
5.6
1600
4.0
800
2.8
400
2.0
200
1.4
100
1.0
50
0.71
25
0.5
VQT1B11.book 31 ページ 2006年8月31日 木曜日 午後4時36分
Summary of Contents for FL360 - DMW - Hot-shoe clip-on Flash
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