Olympus IS-20 Instructions Manual page 29

Press the shutter release
button fully.
Note: The shutter speed is automatically set at 1/100-sec. when the flash fires. The flash will not
fire if the existing light level requires a shutter speed greater than 1/100-sec.
Auto Flash Range
(with color negative film)
Focal length Telephoto and wide angle
ISO 100
4.5m (14.8 ft)
ISO 200
6.4m (21 ft)
ISO 400
9.0m (29.5 ft)
Maximum distance is about 70% when using
positive color film.
29