LEICA APO-SUMMICRON-SL 90mm f/2 ASPH

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  • 11179
The APO-Summicron-SL 75 mm f/2 ASPH. and the APO-Summicron-SL 90 mm f/2 ASPH. are the first... more
Product information "LEICA APO-SUMMICRON-SL 90mm f/2 ASPH"

The APO-Summicron-SL 75 mm f/2 ASPH. and the APO-Summicron-SL 90 mm f/2 ASPH. are the first two of a new line of high-performance lenses for the Leica SL-System. The focal lengths of the two SL-Lenses are ideal for all genres of photography and are particularly suitable for portraiture. While the APO-Summicron-SL 75 mm f/2 ASPH., for example, enables natural portraits, the APO-Summicron-SL 90 mm f/2 ASPH. is a classic focal length for portraiture and creates the often desired slight compression of perspectives. Both lenses are perfectly matched to the SL-System and – just like all currently available and future SL-Lenses – have been designed and constructed for a long service life in professional use.

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 order to reduce this chromatic aberration to a hardly perceptible minimum, both new Summicron-SL lenses are apochromatic – in short: APO – corrected. For this, most of the eleven elements of the optical system – one of which is an aspherical – feature anomalous partial dispersion and are manufactured from sensitive and specially formulated, high-quality glass types.

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 addition, these lenses feature a new, faster autofocus system and a considerably shorter close focusing limit.

As both Summicron-SL primes deliver extremely high imaging performance at their largest aperture, the lenses are also ideal for photography in difficult lighting conditions. The Leica promise of ‘maximum aperture is a usable aperture’ also applies to the new SL-Lenses – stopping down is exclusively a creative imaging tool, and is not necessary for achieving better 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.

The autofocus drive of all SL-Summicron lenses employs extremely powerful and robust stepping motors with DSD® (Dual Syncro Drive™). Thanks to these, the entire focusing throw can be travelled completely in only around 250 milliseconds.

Lens APO-Summicron-SL 90 mm f/2 ASPH.

Angle of view

(diagonal, horizontal, vertical)

27.3 / 22.9 / 15.4 °

Optical design

 

Number of elements/groups

11/9

Number of asphericals

1

Position of entrance pupil in front of the bayonet flange

22.9 mm

Focusing

 
Working range 0.6 m to infinity
Smallest object field 120 × 180 mm
Largest reproduction ratio 1:5
Aperture  
Settings/functions Electronically controlled iris, setting with the camera clickwheel control, half-stop settings possible
Aperture setting range 2 - 22
Smallest aperture 22
Bayonet/sensor format Leica L-bayonet, full-frame 35 mm format
Filter thread E67
Dimensions and weight  
Length to bayonet flange 102 mm
Largest diameter 73 mm
Weight 700 g

 

Lecture by Peter Karbe - SL Objektive: The new generation December 13, 2019 from 6:30 pm to 8:00 pm Peter Karbe is the head of Development Optics at Leica Camera AG. In his talk, he gives an insight into the world of Leica L-mount lenses. The Leica brand stands like no other for the design and construction of excellent lenses. It is, therefore, only to be expected that the new Leica SL-Lenses also deliver unrivaled picture quality. In combination with one of the fastest autofocus systems in the professional camera segment, this makes working with the Leica SL-System an entirely new photographic experience. The SL-System is also compatible with almost all Leica lenses ever made. Refined optical systems guarantee the exceptional imaging quality of the Leica SL-Lenses. In the design of the lenses, particular care has been taken to ensure homogeneous performance at all focal lengths, apertures, and focusing distances. This allows the choice of the ideal SL-Lens for the creative ideas you have in mind for every situation. Up to three elements with aspherical surfaces, predominantly on both sides, are employed within the optical systems for the correction of monochromatic aberration. These demand particularly high precision in the manufacturing process: departures from specified surface curvatures must be within tolerances measured in tenths of micrometers. The positioning of the lens elements relative to the optical axis is also carried out with utmost precision within tolerances of only very few micrometers. That these extremely tight tolerances are met and maintained ensures the outstanding character and perfection of all Leica SL-Lenses. For the correction of chromatic aberration, a very high proportion of the elements is manufactured from specially formulated, high-quality glass types. Their unique optical properties, so-called anomalous partial dispersion, enable the compensation of the chromatic aberrations that unavoidably arise from the optical construction of all lenses. As a result of this, even highlights in images remain free of color fringing. In addition, sophisticated coating on all lens surfaces effectively minimizes reflections, stray light, and flare. Leica SL-Lenses already achieve extremely high contrast values at maximum aperture, which makes them particularly suitable for the creative use of planes of sharpness and unsharpness and the distinct isolation of subject details. Thanks to this shallow depth of field and exceptional imaging performance, every single lens guarantees the special look for which Leica photography is renowned. The lecture is free of charge. Location Leica Store Wetzlar, Leitz-Park Am Leitz-Park 6 35578 Wetzlar... mehr

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