Refined optical systems guarantee the exceptional imaging quality of the Leica SL-Lenses. In the design of the lenses, particular care has been taken to ensure homogeneous performance at all focal lengths, apertures, and focusing distances. This allows the choice of the ideal SL-Lens for the creative ideas you have in mind for every situation.
Up to three elements with aspherical surfaces, predominantly on both sides, are employed within the optical systems for the correction of monochromatic aberration. These demand particularly high precision in the manufacturing process: departures from specified surface curvatures must be within tolerances measured in tenths of micrometers. The positioning of the lens elements relative to the optical axis is also carried out with utmost precision within tolerances of only very few micrometers. That these extremely tight tolerances are met and maintained ensures the outstanding character and perfection of all Leica SL-Lenses.
For the correction of chromatic aberration, a very high proportion of the elements is manufactured from specially formulated, high-quality glass types. Their unique optical properties, so-called anomalous partial dispersion, enable the compensation of the chromatic aberrations that unavoidably arise from the optical construction of all lenses. As a result of this, even highlights in images remain free of color fringing. In addition, sophisticated coating on all lens surfaces effectively minimizes reflections, stray light, and flare.
Leica SL-Lenses already achieve extremely high contrast values at maximum aperture, which makes them particularly suitable for the creative use of planes of sharpness and unsharpness and the distinct isolation of subject details. Thanks to this shallow depth of field and exceptional imaging performance, every single lens guarantees the special look for which Leica photography is renowned.