Nikon F4S - Page 68

On “T,” the shutter stays open until the shutter speed dial is
rotated to another setting, making the setting ideal for really
long time exposures. Exposure mode is automatically set to
Manual. After shutter release, “T” will not cause battery drain
regardless of how long the shutler remains open.
if "T" exposure is less than 32 sec., to complete exposure,
return mirror to viewing position and advance to next frame,
rotate shutler speed dial to any other setting. If "T" exposure is
32 sec. or longer, to complete exposure, turn shutter speed
dial to any other setting, lightly press shutter release bution to
return mirror to viewing position and advance to next frame.
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X Setting
"X" setting provides a top flash sync speed of 1/250 sec. with
Nikon speedlights. For assurance during flash shooting, set the
shutter speed dial to “X”. To unlock, while pressing the lock
release button, shift the shutter speed dial to another setting.
Speedlight synchronization is also possible for dial-selected
speeds from 1/250 sec. and slower.