APO-Summicron-SL 50 f/2 ASPH.

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A versatile standard focal length has been added to the lens portfolio for the Leica SL and other L-Mount systems.

Its focal length makes this SL-Lens extremely versatile and the perfect choice to use in almost any situation – reportage and travel photography, studio work, architectural and landscape photography, portraits, close-ups or documentary photography.

As is the case with the other Summicron-SL lenses, the APO-Summicron-SL 50 mm f/2 ASPH. sets standards and takes its place as the new reference lens among the standard focal lengths. Thanks to the L-Mount standard, the APO-Summicron-SL 50 mm f/2 ASPH. is also fully compatible with cameras manufactured by other partners of the L-Mount Alliance that also use the lens mount developed by Leica.

Twelve extremely complex lens elements – three of which have aspherical surfaces – arranged in ten groups contribute to the outstanding image quality. Even with the aperture at its widest. As with all Leica lenses, this APO-Summicron allows the maximum aperture to be used as the working aperture. In view of this, stopping down is exclusively a creative imaging tool, and is not necessary for achieving better imaging performance. Natural skin tones, soft transitions into the bokeh, outstanding contrast in details and consistent sharpness from edge to edge of distortion-free images are further quality characteristics of the APO-Summicron-SL 50 mm f/2 ASPH.

All glass elements in an optical imaging system – for example lenses – refract light in certain colours to a different extent. This leads to the effect that not all rays of light from a multi-coloured subject are focused at a single imaging point. The result of this is chromatic aberration. In the APO-Summicron-SL 50mm f/2 ASPH. these chromatic aberrations are minimised by apochromatic correction. For this, the majority of the lens elements used in the construction are made from specially formulated, high-quality glass types with anomalous partial dispersion that push even the innovative manufacturing methods of the Leica Factory to the limits of the technically possible.

The autofocus drive of all Summicron-SL lenses employs extremely powerful and robust stepping motors with DSD® (Dual Syncro Drive™). Thanks to these, the entire focusing throw can be engaged in just 250 milliseconds. Leica Camera also takes an innovative approach in the case of manual focusing technology: Summicron-SL lenses feature a totally new manual focusing ring construction concept. In this concept, a ring magnet with alternating north-south polarisation is embedded in the manual focusing ring. The magnetic field changes its polarity when the ring is turned. A sensor monitors the status of the magnetic field and sends the data to the main processor. The drive then shifts the lens to the corresponding focusing position on the basis of the angle of rotation and the rotational speed – this in turn enables even faster and more precise manual focusing.

Both the construction and the design of the cutting-edge Summicron-SL line represent the next step forward in the development of lenses for the Leica SL-System. New, extremely precise manufacturing methods and measuring technologies have been developed especially for the production of these lenses. The results of this are reflected not only in the more compact dimensions and considerably lower weight of the lenses, but also in their excellent imaging performance. In the construction of the APO-Summicron-SL lenses, particular attention has been paid to the prevention of stray light and reflections. Together with an optimisation of the optical and mechanical design, the application of high-quality coating to lens surfaces reduces unavoidable reflections to an absolute minimum. Thanks to effective sealing against dust, moisture and water spray, and Aquadura coating of the exposed lens surfaces, the lenses can be used without a second thought in almost any weather conditions.

In the box:
Lens | Lens Caps | Lens hood | Lens bag

Net weight: 740g

The prefix ‘APO’, which stands for "Apochromatic", in the name denotes Leica lenses with the best imaging performance. From telephotos to wide-angles, all Summicron-SL lenses in the SL-System portfolio bear these coveted three letters before their names. For a long time, this distinction was reserved exclusively for telephoto lenses, as only they could achieve the exceptional quality required.

It is now over 40 years since the first APO lens built by Leica made its appearance – the APO-TELYT-R 180 mm f/3.4, in 1975. In 2012, the APO-Summicron-M 50 mm f/2 ASPH. became the first standard lens to bear this prestigious prefix.

Thanks to technological progress, more complex construction and new manufacturing methods employed in the SL-System, the design engineers were able to perfectly maximise the optical performance.

To us at Leica, APO means more than just the correction of longitudinal chromatic aberration, for which the purely scientific definition of the term ‘apochromatic’ stands. Above and beyond this, all other chromatic and monochromatic aberrations must also be optimised to a similar degree. This performance is corroborated by the corresponding MTF curves, and practically reaches the physically possible diffraction limits. Our quality expectations and demands have grown accordingly throughout the many years since the launch of the first APO lens, with the result that today’s APO lenses are fit for whatever the future may bring and deliver persuasive performance in combination with highest-resolution image sensors.

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