Panasonic has announced the Leica DG Vario-Summilux 25-50mm f/1.7 ASPH lens for Micro Four Thirds cameras that is able to boast a wide-open f/1.7 aperture through the entire zoom range and is designed to pair with the popular Vario-Summilux 10-25mm f/1.7 ASPH.
The Panasonic lenses that are branded “Leica” are manufactured by Panasonic but done so with oversight from Leica to assure high quality. The new Leica DG Vario-Summilux 25-50mm f/1.7 ASPH is constructed of 15 elements in 11 groups and — as the lens’s name suggests — features an aspherical lens and three extra-low dispersion (ED)lenses that Panasonic says effectively suppress axial chromatic aberration and chromatic aberration of magnification. Spherical aberration and distortion are also corrected by the aspherical element which also allowed Panasonic the freedom to create a high-performant lens with a compact size and light weight.
The 25-50mm f/1.7 boasts a minimum focusing distance of 0.28 meters (about 11.2 inches) at the wide end and 0.31 meters (about 12.2 inches) at the telephoto end. The lens has a maximum magnification ratio of 0.42x (35mm camera equivalent) and features a dust and splash-resistant design that can resist temperatures down to 10 degrees below zero. The 25-50mm f/1.7 has a filter diameter of 77mm.
Panasonic says that the maximum 240 frames-per-second high-speed sensor drive allows the lens to realize high speed and high precision autofocusing, and in addition to an inner drive focus system, the lens’s stepless aperture ring and “micro-step” drive in the aperture control system allow a connected camera to easily and smoothly shift to adjust for brightness changes when zooming or panning. The optical design also uses what is Panasonic calls barycentric stability to allow for minimal image shifting while zooming. The lens also has a focus ring that has a linear and non-linear setting that can be switched from the ring.
Together, the new 25-50mm f/1.7 and the 10-25mm f/1.7 cover a wide range from 10mm through 50mm at a wide-open f/1.7 and Panasonic says that the two lenses cover a focusing distance from wide-angle to telephoto, and can function as eight fixed focal length lenses (20mm, 24mm, 28mm, 35mm, 50mm, 75mm, 85mm, 100mm translated to 35mm camera equivalent). Panasonic argues that because of this versatility, the two lenses can offer the same or better level of performance than a set of prime lenses that cover the same range. The two lenses share a maximum aperture as well as a similar shape and functionality which the company says should enable creators the freedom to create with minimal workflow changes.