The Pro815 equipped with a 15X optical zoom with a focal length of 28 – 420mm [35mm equivalent], this means you can shoot from wide angle to telephoto with one lens. Normally it is not possible to incorporate both 28mm wide-angle and 420mm tele-zoom capabilities in a average high-end camera, since they generally, only come with a 7-8X zoom, With SLR systems, different lenses need to be switched to shoot wide-angle and ultra high zoom pictures, this means carrying lots of equipment, missing some shots due to lens changeover and buying multiple lenses. The Pro815 has four low-dispersion glass lenses specially manufactured to minimize chromatic aberration that can occur when wide-angle and ultra high zoom are supported at the same time. In addition it employs two aspherical lenses for the correction of spherical aberration and lateral colours for the entire zoom range from wide to tele. This world-renowned Schneider-KREUZNACH lens offers outstanding reliability. Minimize