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Street, portrait or whatever you want: The APO-Summicron-SL 1:2/75 ASPH. is designed as a universally applicable Lens and opens up new photographic horizons in the border area between normal and telephoto focal lengths. It is perfectly adapted to the modern SL system and has been developed for a long service life under professional conditions. In addition, the largest achievable reproduction scale of 1:5 contributes to the versatility of the Lens.
AF system with Dual Syncro Drive™ - from 0 to sharp in a fraction of a second
The autofocus of the SL-Summicron Lens is fast, precise and quiet. The drive unit determines the AF performance data. These are limited by the weight of the focus lenses, the stroke from infinity to the close-up range and, of course, the available space. In order to maintain the compactness of the Lens, these components must be integrated in a holistic approach.
An interdisciplinary team of optics, mechanics and electronics developers has developed a unique lens concept based on double internal focusing. This system, consisting of two particularly lightweight focus lenses, allows the use of small and compact drive systems. In addition to the spatial restrictions, the choice of drive motors is also determined by the AF principle.
In order to determine the correct focusing direction and then focus precisely, several contrast measurements are required at different focus positions. To do this, the focus lenses must be moved back and forth quickly in accordance with the speed specifications of the contrast AF system. This requires a dynamic drive without backlash.
The SL-Summicron Lens uses extremely powerful and robust stepper motors with Dual Syncro Drive™ as drives. With these, the entire focusing range can be traversed in a few fractions of a second. As a result, the SL-Summicron lenses achieve the best values among full-frame systems in terms of speed, precision and noise emission.
More contrast for more depth of field
With an aperture ratio of 1:2, the SL-Summicron lenses are much more compact than even more light-sensitive Lens systems, but allow you to work with a similar depth of field. The reason for this is the contrast: the viewer perceives the zone of highest contrast as sharp, while the area with a lower contrast in comparison is blurred.
With SL-Summicron lenses, this difference in contrast is much greater than with conventional lenses: Focused objects have a higher contrast than unfocused objects. As a result, objects stand out more from the foreground or background. The subject can be better separated. The result is a three-dimensional image impression with a very impressive depth effect.
Optically and mechanically - a new standard
When designing the SL-Summicron lenses, particular attention was paid to avoiding stray light and reflections. The optical and mechanical design is optimized before the prototypes are built by means of complex simulations. Unavoidable reflections are reduced to the best possible level through high-quality coating of the optical surfaces.
Complex electronics for uncomplicated handling
The three functions of an SL-Summicron Lens that are obvious to the user - focusing, MF ring and aperture setting - are based on a large number of controls and computing operations.
Double focusing in particular places high demands on the electronics. The two independent focusing units must be moved absolutely synchronously and the position data must be evaluated at a very high frequency and passed on to the camera.
Communication with the camera takes place so quickly that there is no perceptible delay. These are the basic prerequisites for fast and precise contrast autofocus.
A ring magnet with alternating north pole-south pole magnetization is embedded in the manual focus ring. If the ring is rotated, the magnetic field changes. A sensor evaluates the magnetic field and sends its measurement signals to the main processor. Depending on the angle and speed of rotation, the focus position is adjusted accordingly.
The aperture is driven by a stepper motor. Special control in microsteps ensures precise, fast, smooth and low-vibration movement.
Convincing down to the smallest detail
In use, the SL-Summicron Lens impresses with its uniform compactness, low weight and excellent feel.
Thanks to the almost identical design of the SL-Summicron lenses, there is no need to feel the MF ring again after a lens change and the center of gravity is largely retained. This means that the camera always sits perfectly in the hand and handling on a tripod is also made easier.
Street, portrait or whatever you want: The APO-Summicron-SL 1:2/75 ASPH. is designed as a universally applicable Lens and opens up new photographic horizons in the border area between normal and telephoto focal lengths. It is perfectly adapted to the modern SL system and has been developed for a long service life under professional conditions. In addition, the largest achievable reproduction scale of 1:5 contributes to the versatility of the Lens.
AF system with Dual Syncro Drive™ - from 0 to sharp in a fraction of a second
The autofocus of the SL-Summicron Lens is fast, precise and quiet. The drive unit determines the AF performance data. These are limited by the weight of the focus lenses, the stroke from infinity to the close-up range and, of course, the available space. In order to maintain the compactness of the Lens, these components must be integrated in a holistic approach.
An interdisciplinary team of optics, mechanics and electronics developers has developed a unique lens concept based on double internal focusing. This system, consisting of two particularly lightweight focus lenses, allows the use of small and compact drive systems. In addition to the spatial restrictions, the choice of drive motors is also determined by the AF principle.
In order to determine the correct focusing direction and then focus precisely, several contrast measurements are required at different focus positions. To do this, the focus lenses must be moved back and forth quickly in accordance with the speed specifications of the contrast AF system. This requires a dynamic drive without backlash.
The SL-Summicron Lens uses extremely powerful and robust stepper motors with Dual Syncro Drive™ as drives. With these, the entire focusing range can be traversed in a few fractions of a second. As a result, the SL-Summicron lenses achieve the best values among full-frame systems in terms of speed, precision and noise emission.
More contrast for more depth of field
With an aperture ratio of 1:2, the SL-Summicron lenses are much more compact than even more light-sensitive Lens systems, but allow you to work with a similar depth of field. The reason for this is the contrast: the viewer perceives the zone of highest contrast as sharp, while the area with a lower contrast in comparison is blurred.
With SL-Summicron lenses, this difference in contrast is much greater than with conventional lenses: Focused objects have a higher contrast than unfocused objects. As a result, objects stand out more from the foreground or background. The subject can be better separated. The result is a three-dimensional image impression with a very impressive depth effect.
Optically and mechanically - a new standard
When designing the SL-Summicron lenses, particular attention was paid to avoiding stray light and reflections. The optical and mechanical design is optimized before the prototypes are built by means of complex simulations. Unavoidable reflections are reduced to the best possible level through high-quality coating of the optical surfaces.
Complex electronics for uncomplicated handling
The three functions of an SL-Summicron Lens that are obvious to the user - focusing, MF ring and aperture setting - are based on a large number of controls and computing operations.
Double focusing in particular places high demands on the electronics. The two independent focusing units must be moved absolutely synchronously and the position data must be evaluated at a very high frequency and passed on to the camera.
Communication with the camera takes place so quickly that there is no perceptible delay. These are the basic prerequisites for fast and precise contrast autofocus.
A ring magnet with alternating north pole-south pole magnetization is embedded in the manual focus ring. If the ring is rotated, the magnetic field changes. A sensor evaluates the magnetic field and sends its measurement signals to the main processor. Depending on the angle and speed of rotation, the focus position is adjusted accordingly.
The aperture is driven by a stepper motor. Special control in microsteps ensures precise, fast, smooth and low-vibration movement.
Convincing down to the smallest detail
In use, the SL-Summicron Lens impresses with its uniform compactness, low weight and excellent feel.
Thanks to the almost identical design of the SL-Summicron lenses, there is no need to feel the MF ring again after a lens change and the center of gravity is largely retained. This means that the camera always sits perfectly in the hand and handling on a tripod is also made easier.
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