It's a new cutting-edge interchangeable lens LUMIX G X VARIO PZ 14-42mm/F3.5-5.6 ASPH./POWER O.I.S. with electric-powered zoom operation from the new premium lens brand “X” for LUMIX G Micro System that complies with Micro Four Thirds System standard. Crystallizing Panasonic's optical technologies, new premium lens brand “X” features superb image rendering for lifelike textures, crisp edge-to-edge contrast, a unique Nano Surface Coating for minimal ghosts and flaring and natural atmospheres with remarkable transparency.\n\nComprising of 9 lenses in 8 groups, the lens system features excellent contrast at entire zoom range. The inclusion of 4 aspherical lenses that helps achieving the downsizing of lens unit also improves optical performance by minimizing distortion, even at the 28 mm wide end. The 2 ED lenses effectively compensates for the chromatic aberration. And, the retractable-type zoom lens boasts outstanding compactness with approx. 26.8 mm in length and approx. 95g in weight to realize ultra-high mobility.\n\nPanasonic's Nano Surface Coating technology is adopted to minimize the reflection at entire visual light range (380nm-780nm) by applying the extra-low refractive index coating with nano-sized structure on the surface of the lens. It results in the super clear image with dramatic reduction of ghost and flare.\n\nAdopting an inner focus system driven by a stepping motor, the superior optical design realizes outstanding smoothness to support the high speed AF system of LUMIX G cameras. It achieves approx. 0.1 second Light Speed AF thanks to the downsizing of focus lens and its amount of movement. By speeding up the aperture control, shutter time lag is also shortened by approx. 40% compared with the LUMIX G VARIO 14-42mm/F3.5-5.6 ASPH. /MEGA O.I.S..\n\nFor a digital interchangeable lens as of August 26, 2011./ When the lens is retracted./ The time for focusing on the subject is measured with the DMC-GF3 to move the lens position to ""2m"" from ""infinity"" position at wide-end. Panasonic measurement method.5/ Measured with DMC-GF3. The time required to start exposure after the shutter button is fully pressed after the lens position is moved from “infinity” to “2m”. The zoom position is at wide-end.5/ 5 The firmware of the GF3 must be updated to Ver.1.1 or later. Panasonic measurement method.