Medium telephoto lens

Street, portrait, or whatever catches your eye: Conceived as a universal lens for any situation, the APO-Summicron-SL 75 f/2 ASPH. opens up new horizons for photography in the versatile zone between standard and telephoto focal lengths. It is perfectly matched to the cutting-edge SL-System and has been designed for a long life under a heavy professional workload. In addition to this, the maximum reproduction ratio of 1:5 contributes even more to the versatility of the lens, allowing for close-up shots that pop with punchy sharpness and definition. 

AF System with Dual Syncro Drive™
From zero to sharp in no time at all

The autofocus system shared by the Summicron-SL lenses is fast, precise, and nearly silent. Their outstanding AF performance figures are thanks to the autofocus drive unit they both utilize. These are limited only by the mass of the glass elements moved when focusing; the speed of moving from infinity to the closest focusing distance. In order to preserve the compact dimensions of the lenses, the integration of these components must be perfectly optimized within all design constraints. 

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Specialists from the areas of optical engineering, mechanical engineering and electronics worked together as an interdisciplinary team on the development of a unique lens concept based on double internal focusing. This system, comprising two especially light focusing lenses, allows the construction of particularly small and compact drive systems. While being able to work within tight space constraints, the drive motors used must maintain peak performance in all situations to be chosen for such a cutting-edge camera system.

Several contrast measurements at various focusing positions must be made before the correct direction for focusing can be determined and followed by precise focusing. In this procedure, the focusing lens elements must be moved rapidly in accordance with the speed specifications of the contrast AF system. This requires a dynamic drive system without any room for error.

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 range 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 operating noise. 

Higher Contrast
for greater visual depth

With a maximum aperture of f/2, the SL-Summicron lenses are significantly more compact than even faster lenses, but still allow photographers to work with similar depth of field. The reason for this is contrast: the area of highest contrast is incredibly sharp, while zones with lower contrast are unsharp or beautifully blurred.

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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 “pop” more distinctly out of the foreground or background and more effectively isolate the subject. This creates a three-dimensional visual effect with very impressive depth.

Optically and Mechanically
a new standard

In the construction of the Summicron-SL lenses, particular attention has been paid to the prevention of stray light and reflections. The optimization of the optical and mechanical design was carried out in elaborate simulations before the construction of the first prototype lenses. Unavoidable reflections are reduced to the lowest possible level by high-quality optical coatings of the lens surfaces.

Complex Electronics
for uncomplicated handling

The focusing and aperture setting functions of a SL-Summicron lens are based on a multitude of control systems and mathematical operations. The demands on the electronics are particularly high in the case of the double focusing system. 

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Complex Electronics - Asset 1
Complex Electronics - Asset 2
Complex Electronics - Asset 3

The two autonomous focusing units must be moved in perfect synchronization and positioning data have to be analyzed at a very high sampling rate and passed on to the camera. Here, the communication with the camera is so fast that there is no perceptible delay. These are the primary preconditions for fast and precise contrast AF.

The aperture is driven by a stepping motor. Here, a special micro-step control system ensures precise and fast movements with minimized vibration.

Manual Focusing
A new experience

SL-Summicron Lenses feature a totally new manual focusing ring construction concept. In this concept, a ring magnet with alternating north-south magnetization 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.

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The construction of the MF-ring guarantees reliable sealing against dust and water spray, provides protection against impacts and other mechanical stresses, and prevents focusing inaccuracies as a consequence of temperature fluctuations. Even after years of use, the MF-ring of a SL-Summicron lens impresses with a smooth action without play and homogeneous focusing.

down to the smallest detail

The consistently compact dimensions, low weight, and the excellent grip and feel of the SL-Summicron lenses are particularly impressive when shooting. Thanks to the nearly identical design of both Summicron-SL lenses, with similar center of gravity and handling, users will feel at home when switching between the two without any adjustments needed. The lenses balance the camera nicely, for both a more comfortable handheld shooting experience and easier steadying on a tripod. 

Proofs of performance
APO-Summicron-SL 75 f/2 ASPH. in Action

In terms of sharpness and structure, the results are unsurpassable and working with the Leica SL in connection with this lens is also a lot of fun.
Arndt Sauerbrunn

Arndt Sauerbrunn took the new 90mm SL prime lens out to test its capabilities: APO-Summicron-SL 75 f/2 ASPH. The new APO-Summicron-SL 75 f/2 ASPH. and APO-Summicron-SL 90 f/2 ASPH. represent the 75mm and 90mm extensions to the range of Leica SL-Prime lenses.

Blog Arndt Sauerbrunn 75er 1512x1008 1 Blog Arndt Sauerbrunn 75er 1512x1008 2 Blog Arndt Sauerbrunn 75er 1512x1008 3 Blog Arndt Sauerbrunn 75er 1512x1008 4 Blog Arndt Sauerbrunn 75er 1512x1008 5

Both of these professional lenses continue the long and successful tradition of Leica’s unmatched craftsmanship, offering uncompromising durability and a range of outstanding features. The Dual Syncro Drive™ with two ultra-lightweight lens elements enables extremely precise and nearly silent autofocusing, while extremely high contrast values at maximum aperture mean that these lenses provide the quintessential Leica look, in terms of shallow depth of field and isolation of subject details. Düsseldorf-based photographer Arndt Sauerbrunn road-tested both lenses on his latest fashion shoot and we caught up with Arndt to get his take on the Leica SL-System‘s latest optical achievement.

Technical Data

APO-Summicron-SL 75 f/2 ASPH.

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Order-number 11 178
Field angle (diagonal, horizontal, vertical) 31,8°/26,7°/18,0°
Optical design
Number of lenses/groups 11/9
Number of aspherical lenses 1
Entrance pupil position 35.9 mm
Distance setting
Working range 0.5 m to infinity
Smallest object field 120 x 180 mm
Largest reproduction ratio 1:5
Setting/function Electronically controlled aperture, set using turn/push wheel on camera, including half values
Aperture setting range 2-22
Lowest value 22
Bayonet/sensor format Leica L bayonet, full-frame 35mm format
Filter mount E67
Dimensions and weight
Length to bayonet mount 102 mm
Largest diameter 73 mm
Weight 720 g

Constructional Details

The optical system of the APO-Summicron-SL 75 f/2 ASPH. is comprised of 11 elements, one of which has an aspherical surface. A very high proportion of these elements is manufactured from specially formulated, high-quality glass types for the correction of chromatic aberration. Their particular optical property, so-called anomalous partial dispersion, enables compensation for chromatic aberrations resulting from the other glasses in the optical system. As a result of this, even highlights in images remain almost completely free of color fringing.

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75 f/2 ASPH.

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Name Order number
APO-Summicron-SL 75 f/2 ASPH. 11178
Lens rear cap SL 16064
Lens cap SL 16045
Lens Hood for SL 75 f/2 ASPH. and 90 f/2 ASPH. 12302
Filter ND 16x E67, black 13071
Filter UVa II, E67, black 13040
Filter P-cir, E67, black 13049
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