FujiFilm KLASSE W Owner's Manual page 26

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Flash distance
The flash distance ensuring correct exposure depends on the film speed in use and aperture settings (on the
aperture AE mode). When using the flash with the program AE mode, keep your subject within the range of flash
distances indicated in the following chart.
Film speed (ISO)
ISO 50
ISO 100
ISO 200
ISO 400
ISO 800
ISO 1600
When using negative film, the flash distance can be greater because the exposure latitude with negative film is wider than that
of reversal film.
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Flash distance
KLASSE W
0.3m to 2.3m
0.3m to 3.2m
0.3m to 4.5m
0.5m to 6.4m
0.6m to 9.1m
0.9m to 12.9m
KLASSE S
0.4m to 2.8m
0.4m to 3.9m
0.4m to 5.6m
0.5m to 7.9m
0.7m to 11.1m
1.0m to 15.7m
(When using reversal film)