6x G Lens power zoom for movies and stills This G Lens for E-mount cameras delivers stunning still or movie imagery with the flexibility of 6x power zoom. Maximum aperture is a constant F4 from 18 mm wide angle to 105 mm medium telephoto, with excellent resolution and contrast throughout. A lever and ring on the lens barrel allow zoom speed to be freely adjusted as required while maintaining a sure, stable grip. One lens for diverse shooting needs Whether you shoot stills or movies, the zoom range and quality of this fine G Lens will be more than enough for most shooting situations. And you get smooth power zoom. Superb rendering at any focal length An advanced optical design that incorporates two ED (Extra-low Dispersion) glass elements and three aspherical elements offers enviable G Lens image quality throughout the zoom range. Zoom technology inherited from pro gear Sony Handycam® technology has been implemented in the SELP18105G to ensure smooth, quiet zooming that is ideally suited to moviemaking, with no variation in lens length. Continuously variable zoom speed control Fingertip control of zoom speed makes it possible to zoom smoothly while maintaining a steady hold on the camera. A significant advantage when shooting movies. Lens Configuration Impeccable Sony G Lens design emphasizes a graceful balance between high resolution and gorgeous background bokeh that can enhance the artist’s vision. MTF Chart MTF (Modulation Transfer Function) describes how well a lens can reproduce fine details, measured as the degree of contrast achieved between finely spaced lines.