found at DigiDirect
The Olympus M.Zuiko Digital 25mm f/1.8 Lens (Black) fast aperture of f1.8 makes it perfect for low-light photography and portraits. Versatile yet simple this lens incorporates Olympus' MSC focusing system (Movie & Still Compatible) to provide extremely fast yet silent autofocusing for both stills and video. Its special manual focus clutch mechanism makes switching between autofocus and manual focus extremely easy.
Two aspherical elements are used in the optical design to help reduce spherical aberrations in order to achieve a high degree of sharpness, and these elements also help to reduce the overall size and weight of the lens.
This lens features Movie and Still Compatible (MSC) autofocus with an inner focus system, which provides fast focusing for stills work and runs smooth and quiet, important when shooting video. Three aspherical elements, including a Dual Super Aspherical element to correct aberrations, as well as a High Refractive index element to correct high spherical aberrations, provide quality imaging and ZERO (ZUIKO Extra-low Reflection Optical Coating) lens coatings are applied to the elements to reduce lens flare and ghost images
The Olympus M.Zuiko Digital 25mm f/1.8 Lens's build-quality is also top-notch with the use of a metal lens barrel with a premium finish.