A multiple group variable focal length lens is provided. The lens has a
first lens group including a variable power lens element and is
positioned in a stationary manner along an optical axis. The lens also
has a second lens group moveably positioned along the optical axis. The
variable power lens element can be an electrically controllable liquid
lens having a surface with a variable radius of curvature created by two
liquids having distinct indices of refraction with one of the liquids
having an index of refraction greater than 1.60. Alternatively or
additionally, at least one of the liquids used in the liquid lens can
include nanoscale particles.