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LEICA APO-SUMMICRON-M 90 mm f/2 ASPH.

This lens is unique because apochromatic correction and an aspherical surface are combined for the first time. Two of the five lens

elements are made of high-refraction optical glass, and two others make judicious use of anomalous partial dispersion. Brilliance

and resolving power are already outstanding at full aperture. Artificial vignetting is extremely low. These features lead to superlati-

ve results – in every application: such as portraiture, reportage or studio photography. In addition, its compact design and high

speed make it ideal for hand-held photography.

Lens shape

Asphere

Summary of content (7 pages)

PAGE 1
LEICA APO-SUMMICRON-M 90 mm f/2 ASPH. This lens is unique because apochromatic correction and an aspherical surface are combined for the first time. Two of the five lens elements are made of high-refraction optical glass, and two others make judicious use of anomalous partial dispersion. Brilliance and resolving power are already outstanding at full aperture. Artificial vignetting is extremely low.
PAGE 2
LEICA APO-SUMMICRON-M 90 mm f/2 ASPH. Engineering drawing Technical Data Angle of view (diagonal, horizontal, vertical) Optical design 27°, 23°, 15° Number of elements / groups: 5 / 5 Focal length: 90.9 mm Entrance pupil: 58.
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LEICA APO-SUMMICRON-M 90 mm f/2 ASPH. 3 MTF graphs Aperture Stop 2.0 [%] 100 80 80 60 60 40 40 20 20 0 0 5 10 Aperture Stop 5.6 [%] 100 15 20 Y' [mm] 0 0 5 10 15 Aperture Stop 2.8 [%] 100 The MTF is indicated both at full aperture and at f/5.6 at long taking distances (infinity). Shown is the contrast in percentage for 5, 10, 20 and 40 lp/mm accross the height of the 35 mm film format, for tangential (dotted line) and sagittal (solid line) structures, in white light.
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LEICA APO-SUMMICRON-M 90 mm f/2 ASPH. 4 Distortion [%] 5 4 3 2 1 0 -1 -2 -3 -4 -5 0 Effective Distortion Relative Distortion Y' [mm] 12 9 6 3 5 10 15 0 20 0 3 6 9 12 15 18 X' [mm] Y' [mm] Vignetting [%] 100 5.6 2.8 2.0 80 60 40 Vignetting is a continous decrease of the illumination to the edges of the image field. The graph shows the percentage lost of illumination over the image height. 100% means no vignetting.
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LEICA APO-SUMMICRON-M 90 mm f/2 ASPH.
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LEICA APO-SUMMICRON-M 90 mm f/2 ASPH.
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LEICA APO-SUMMICRON-M 90 mm f/2 ASPH. ! " #" !$ ! " #" !$ ! % &' ! % &' Leica Camera AG / Oskar-Barnack-Straße 11 / D-35606 Solms / Telefon + 49 (0) 6442-208-0 / Telefax + 49 (0) 6442-208-333 www.leica-camera.com / info@leica-camera.