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A new prime lens for the Leica SL-System

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The launch of the Apo-Summicron-SL 35 mm f/2 Asph lens marks a further addition to the portfolio of high-performance lenses for the Leica SL-System. Thanks to the L-Mount standard used for this lens, the Apo-Summicron-SL 35 mm f/2 Asph is also fully compatible with cameras manufactured by other partners of the L-Mount Alliance with the lens mount developed by Leica.

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 new Apo-Summicron-SL 35 mm f/2 Asph these chromatic aberrations are minimised by apochromatic correction. For this, the majority of the thirteen lens element used in the construction of the lens – five of which have aspherical surfaces – are made from specially formulated high-quality glass types with anomalous partial dispersion.

The autofocus drive of all Summicron-SL lenses employs extremely powerful and robust stepping motors with DSD®. Thanks to these, the entire focusing throw can be travelled completely in only around 250 milliseconds. Leica shows its innovative powers not only in the case of autofocus technology, but also when it comes to manual focusing: Summicron-SL lenses feature a totally new concept for manual focusing in which a ring magnet with alternating north-south magnetization is embedded in the 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.

The Apo-Summicron-SL 35 mm f/2 Asph will be on sale from April 2019.

For further information visit: Leica Camera

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