At present, the switching time of the dual
field of view lens of the QUANHOM team is ≤3S.  There are many factors that
influence the parameter. Firstly, for the optical design aspect, the
moving distance of the moving lens group plays a defining role in the switching
time. Secondly, in the mechanical design aspect, the design of the cam curve
and the selection of the electric motor influence a lot on the speed of switching
the field of view. Finally, the control of the electric motor and Automatic
Focusing Algorithm, to some extent, also exert influence on the speed of switching
the field of view.