The presentation device 100 comprises a shuttle operation member 170
rotatable in the forward and reverse directions. The shuttle operation
member 170 comprises a momentary mechanism, returning automatically to
the neutral position when the user releases the hand. When a
sub-microprocessor 360 inputs from the shuttle operation member 170
signals representing operating direction and operating angle, on the
basis of these signals, it determines a zoom direction and zoom speed,
and by giving an instruction to a lens control microprocessor 127 or a
picture signal processor IC 300, performs optical zoom or digital zoom.
By means of this correction, operability in zoom operations in the
presentation device is improved.