Miniature auto-focus cameras of the type widely used in cell phones, have traditionally used voice coil motors to move the entire optical train to alter the focus setting.  This technology mainstay has performance limitations that are becoming increasingly apparent for high resolution cameras that use small diagonal image sensors in a compact form factor.  This webinar will provide an introduction to miniature auto-focus camera technology and voice coil motors.  It will explain lens tilt lens, de-centering and position hysteresis and the effect that these have on image quality and auto focus algorithms.  The webinar will conclude with a look at the emerging alternative of using MEMS actuators to provide auto-focus for miniature cell phone cameras and their merits and limitations compared with voice coil motors.