The portable ultra-wide-angle zoom lens is conceived for use with 4K TV cameras. The high-precision, large-diameter aspherical lens minimises optical distortions and out-of-focus blurs at the image borders, which are typical problems for ultra wide-angle lenses otherwise. Instead, this lens guarantees stable HD resolution at any zoom range. Thanks to a wide-angle focal length of 4.5 mm, the photographer can approach a motif at a distance of only 30 cm.