Panasonic DMWFL500E - Manual (Page 23)

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VQT0Z62
Push the [MODE] button, and select the flash
mode. (P20)
≥ The guide number (GN) and light quantity ratio
appear on the display panel.
A: Light quantity ratio
≥ The “light quantity ratio” is the ratio of the
flash intensity to the full flash.
1 Push the [ZOOM] button to set
the zoom value to the focal
length of the lens.
2 Turn the [GN/ISO] dial, and set
the guide number (GN).
≥ The [F] dial can also be used for this
setting.
3 Push the shutter button all the
way down, and take the photo.
∫
How to determine the aperture and guide
number
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 P31.
[MANUAL]
A
ZOOM
GN/ISO
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
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