For Descriptive Performance and Beautiful Bokeh: S-R1428 is comprised of 14 lens elements in 10 groups with the use of aspherical lenses and 2 ED lenses to suppress chromatic aberration. Smooth, Silent Operation: Lens works with your S Series cameras high-speed, high-precision contrast AF system with the sensor drive at a maximum 240 fps. Excels in Video Recording Performance: The lens features a mechanism that suppresses focus breathing, which was a fatal problem of all interchangeable lenses designed for still image photography. Extraordinarily Compact and Lightweight: Weighing approximately 12.7 oz (345 g), the LUMIX S 14-28mm F4-5.6 MACRO boasts 0.25 (at 14mm) - 0.5x (at 28mm) macro capability. Rugged Dust- and Splash-Resistant Design: Lens withstands use under harsh conditions, even at 10 degrees below zero*. *Dust- and Splash- Resistant does not guarantee that damage will not occur if this lens is subjected to direct contact with dust and water.