LEICA SL 28MM F/2 APO-SUMMICRON ASPH

Leica APO-Summicron-SL 28mm f/2 ASPH.

The APO-Summicron-SL 28mm f/2 ASPH. combines a classic wide-angle focal length with state-of-the-art technology. Its angle of view provides a good overview, both for interior and exterior scenes, without any undue distortion of the perspective. AF System with Dual Syncro Drive™

From zero to sharp in no time

The AF system of the Summicron-SL lenses is fast, precise, and almost silent. They thank their outstanding AF performance figures to the autofocus drive unit they share. These are limited only by the mass of the lens elements moved when focusing, the travel from infinity to the closest focusing distance and, of course, the amount of space available. In order to preserve the compact dimensions of the lenses, the integration of these components must follow an integral approach.

In the Summicron-SL lenses, the drive units installed are extremely powerful and robust stepping motors with Dual Syncro Drive™. Thanks to these, the entire focusing throw can be traveled completely in fractions of a second. This means that the Summicron-SL lenses achieve values that are among the best in the full-frame system segment in terms of speed, precision, and noise emissions. 

Higher Contrast for greater perceived depth

With an initial aperture of f/2, the SL-Summicron lenses are significantly more compact than faster lenses, but still allow photographers to work with similar depth of field. The reason for this is contrast: the zone of highest contrast is perceived by viewers as being sharp, while zones with lower contrast are regarded as being unsharp.

In the case of SL-Summicron lenses, this difference in contrast is considerably higher than that of conventional lenses: sharply focused objects show much higher contrast than objects that are out of focus. This means that objects “snap” more distinctly out of the foreground or background and more effectively isolate the subject. This creates a three-dimensional visual effect with very impressive apparent depth.

Constructional Details

What makes the APO-Summicron-SL 28mm f/2 ASPH. so special is an optical system comprising of 13 lens elements produced with unique expertise and the latest manufacturing technology by Leica. Of these, three elements with six aspherical surfaces correct monochromatic aberration, while eight elements manufactured from specially formulated, high-quality glass types ensure chromatic correction throughout the entire focusing range. 

Only the particular optical property of these glass types, known as anomalous partial dispersion, makes it possible to compensate for chromatic aberrations with such perfection. As a consequence of this, even highlights in images remain almost completely free of color fringing.