1. A camera module comprising: a housing; an image sensor disposed within said housing; an actuator disposed within said housing; and an optical train at least partially disposed within said housing, said optical train including a first fixed lens group, a second fixed lens group comprising a special lens nearest said image sensor, said special lens having different magnification near its center than near its periphery, and at least one movable lens disposed between said first and said second fixed lens groups and being coupled to said actuator; and wherein said actuator is fixedly aligned to said first and said second fixed lens groups; and said actuator is configured to move said at least one movable lens relative to said image sensor and said first and said second fixed lens groups in an auto-focus operation of said camera module.