Panasonic DMW-FL28E Operating Instructions Manual page 17

How to select aperture
F number is Guide Number / distance.
If the light source on the camera side alone is used, the subject receives only direct light from the front and very dark
shadows may appear in the background. When adding one light in a slanting direction, the shadows will be softened.
• The procedure to determine the shutter speed is the same as when only one flash is used.
Operating distance
The operating distance is the maximum distance between the flash at the camera side and the slave (this unit) when the
flash and the photoreceptor of the slave face each other. The standard operating distance is 10 m approximately when
the Guide Number of the flash at the camera is more than GN 10.
°Indoor or night time at the ambient temperature 20 oC
• The operating distance becomes shorter to a greater degree with the center of the photoreceptor of the slave being
deflected more from the flashtube of the flash at the camera side.
• The operating distance becomes shorter outdoors (daytime) as the sensitivity of the slave is degraded.
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