This is the first zoom lens for the Leica S system. In a medium format S camera, the focal lengths covered is equivalent to a 24-72mm on a 35mm camera.
The lens is very compact in size compared to the other prime lenses in the S system. It is almost in the same size as a stand Summarit-S 70mm F2.5 ASPH Lens.
The lens comprises 14 elements in 4 groups. 9 elements are with partial anomalous dispersion, and 3 of them are fluoride lenses to reduce chromatic aberrations.
There are 2 aspherical surfaces on the rear element to minimize the monochromatic aberrations, and another on the front lens of the second group maintain consistent close-up image performance.