The APO-Summicron-SL 28 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.
The ability to accentuate the focal plane at open aperture without loss of quality gives the photographer a far greater scope of creative possibilities. This makes the APO-Summicron-SL 28 f/2 ASPH. not just a universal lens, but one that produces truly extraordinary compositions.
These are times of great uncertainty, but as photographers we can still pursue our craft by turning our lens on our own country.
I have traveled the globe and photographed countless places around the world, and while I see myself first and foremost as a citizen of the world rather than a Japanese national, Tokyo is where I learned and developed my craft as a photographer and it is the place I call home.
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.More Details
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.
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.More Details
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.
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 dual-synchro drive focusing system.More Details
The two autonomous focusing units must be moved in perfect synchronization and positioning data must 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 autofocus.
The aperture is driven by a stepping motor. Here, a special micro-step control system ensures precise and fast movements with minimized vibration.
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.More Details
The construction of the manual focus 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 manual focus ring of a SL-Summicron lens maintains 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 almost identical design of the Summicron-SL lenses, each one handles nearly identically and the center of gravity remains largely the same. This means that the camera always lies perfectly in the hand and makes working from a tripod much easier.
APO-SUMMICRON-SL 1:2/28 ASPH. in action
What makes the APO-Summicron-SL 28 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.More Details
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.
|Order Number||11 183|
|View angle (diagonal/horizontal/vertical) Full-frame (24 × 36 mm)||75.4°/65.5°/46.4°|
|Number of lenses/assemblies||13/10|
|Number of aspherical surfaces||6|
|Position of the entrance pupil before the bayonet||74.2 mm|
|Focus range||0.24 m to infinity|
|Setting||Choose automatic (Autofocus) or manual mode on the camera|
|Smallest object field||Full-frame: 120 × 180 mm, M8: 319 × 478 mm|
|Setting/Function||Electronically controlled aperture, setting on the camera, half or third values can also be set|
|Bayonet||Leica L bayonet fitting with contact strip|
|Lens hood||Screw-on (included in the scope of delivery)|
|Length||approx. 102/133 mm (without/with lens hood)|
|Diameter||approx. 73/105 mm (without/with lens hood)|
|Weight||approx. 700/750 g (without/with lens hood)|
Place your order now:
50 f/2 ASPH.
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