Good to know- This wide-angle zoom is compact and lightweight, so you won't need to think twice about including it in your kit bag- For corner-to-corner sharpness, Sony have packed in two ED (Extra Low Dispersion), one ED aspherical and three aspherical elements- A circular 7-blade f/4 aperture creates a bokeh defocus effect that'll make your subject pop- The two Linear Motors are fast and accurate at focusing, whether you're shooting video or stills- It's ready to face the elements thanks to its dust and moisture resistant design