Nikon 1 J1 Reference Manual page 81

[] Shutter Speed
Shutter speed is restricted to the following ranges when a flash is used:
[] Aperture, Sensitivity,and FlashRange
Flash range varies with sensitivity (ISO equivalency) and aperture. With
the standard zoom lens at maximum aperture and ISO sensitivity set to
ISO 100 to 3200, the range is approximately 0.6 m-S.O m (2 ft-16 ft)
when the lens is zoomed all the way out, 0.6 m-3.0 m (2 ft-9.8 ft) at
maximum zoom.
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