What is the better the zoom range?
For the overall quality of the lens, in fact, the greater the scope of zoom, the lens quality is also worse. 10 times the zoom lens is most often encountered two problems is the lens distortion and dispersion.
For dispersions manufacturers usually use anti-dispersion lenses to avoid, such as Nikon's ED lenses. With the advancement of optical technology, the current 10 × zoom lens in fact in the optical performance should be able to meet the needs of our daily shooting
The greater the theoretical zoom, the more likely to produce deformation of the lens. Of course, many manufacturers have done a lot of efforts. For example, manufacturers will usually be added in the lens aspherical lens to prevent the generation of this deformation.
Purple side of the situation are more serious, large zoom lens is easy to produce barrel-shaped deformation at the wide-angle end, and in the telephoto end produce pincushion deformation, although the lens deformation is inevitable, but the good lens will deformation control in a reasonable Within range.
