The world's first 400mm ultra-telephoto all-in-one zoom lensThe new Model B028 is the world's first lens for APS-C DSLR cameras that covers a focal length range of 18-400mm and achieves a zoom ratio of 22.2x. The focal length of 400mm on the telephoto end enables the capturing of ultra-telephoto pictures with the 35mm equivalent of 620mm angle of view. Now a photographer can readily enjoy the power of ultra-telephoto to bring distant subjects closer as well as the perspective-flattening effects that only extreme telephoto settings can achieve. It allows a photographer to switch from wide-angle to ultra-telephoto without changing lenses, making it faster and easier to capture a much wider range of subjects including travel scenes, wildlife, action sports, landscapes, cityscapes, portraits and food.Excellent image quality across the entire zoom rangeThe optical construction of the B028 consists of 16 lens elements in 11 groups. The use of specialized glass elements such as LD (Low Dispersion) and aspherical lens elements effectively minimizes wide-ranging aberrations, including chromatic aberrations and distortion, thereby assuring outstanding image quality. Optimum power distribution among the individual lens element groups achieves both the optical performance and the compact size necessary for an ultra-telephoto all-in-one zoom lens that boasts 400mm focal length. Also, it enables tele-macro photography with a maximum magnification ratio of 1:2.9.Lightweight and compact designDespite being an all-in-one zoom lens that achieves 400mm ultra-telephoto, Model B028 is light and compact with a total length of 4.8in. and a weight of 24.9oz. A new lens barrel design utilizing three-step extensions was developed to enable the necessary elongation to produce a 22.2x zoom ratio. Compared to the conventional approach, the division into a larger number of cams ensures comfortable operation and stability while zooming.