Summicron 90 mm f:2,0 (I)

Características

Código - SEOOF-M/11123, later SEOOM 11123 chrome and 11122 black INVOO- diafragma preseleccionado (encargo especial) LLC - 174; lens head only
Producción - 1957-1962, 490 rosca M39, 4430 bayoneta Leica M < 15,500 ejemplares
Variantes - Negro, Cromado, Negro/Cromado; anillo de diafragmas preseleccionado, marcados con f/16 o f/22; anillo de enfoque no facetado (UFK)
Montura - Bayoneta Leica M, Rosca M39; la celda óptica se desenrosca para usar con Visoflex, vendida separadamente 11 133-cromado - 11 124-negro, 3500 ejemplares producidos en 1960

Angulo de visión (diagonal, horizontal, vertical) : 35mm (24 x 36 mm) - 27°, 23°, 15°
Diseño Óptico:
Número de lentes/grupos 6 /5
Longitud focal efectiva -
Posición de la pupila de entrada
Intervalo de enfoque: - 1 m a infinito (0,76 cm con Visoflex)

Escalas: en metros o pies
Campo visual mínimo:220 mm x 330 mm en Visoflex: 148 x 222 mm
Factor de reproducción: 1:9, en Visoflex 1:6,17

Diafragma - f/2,0-f/16 o f/22 con click, valores intermedios, diafragma manual tipo iris de 15 hojas

Montura de filtros: E48 - A63.7
Parasol: HMOOD

Uso en Visoflex:
  • Visoflex I / PLOOT - UXOOR /Fuelle II: 16598 - UOOZK;
  • Visoflex II / III - Visoflex anillo de extensión macro: 16474 - OUEPO Montura corta: 16463 - ZOOEP; Montura corta con diafragma preseleccionado: 11126 - OERDO; Anillo de diafragma standard: 11124 - OESBO; adaptador para rosca M39: 14017 - ZOOUK; Adaptador para bayoneta: 14019 - ZOMUK

Longitud hasta la bayoneta - 110 mm
Diámetro máximo - 62 mm
Material: Latón cromado
Peso - aprox. 660 g

Inscripción - LEITZ CANADA 165XXXX SUMMICRON 1:2/90
Ernst Leitz Canada Ltd. Midland Summicron f = 9cm 1:2 Nr. 158xxxx

Diseño: Walter Mandler

Referencias

Descripción




The second version has a built-in lens hood and manufactured in Canada only, in screw mount and bayonet versions.

At first in chrome, later black anodized only.

Lens head could be bought separately for Visoflex use.

From 1959 the second version (again a six-element lens, but with different glass types and optical prescription) has been produced. This one is a Midland design. At maximum aperture the overall contrast is medium. The clear definition of coarse detail enhances the overall visual performance. The lens is still sensitive to flare, but less than the predecessor.At medium apertures excellent quality over most of the picture area can be expected. The family trait of the wide aperture 90mm lenses of vintage design is the relatively large gap between the performance at maximum aperture and stopped down. We often do not realize the amount of light energy that flows through a lens with a diameter of almost 50mm. And how forceful the aberrations are acting to degrade the potential image quality. It is relatively easy to note the differences in performance, but much more difficult to appreciate the efforts of the designers to control these aberrations. This second version seems to be made only in bayonet mount till 1979 and sold about 27000 units. Leitz tinkered with the design of the mount and numerous changes of the focusing and diaphragm rings have been recorded. The lens has a most imposing presence and coupled to a very fine performance must have been one of the objects of desire in the Leica lens range.

260032867 4d8a8a7be8 1 -
summicron 90 Leitz Canada 1957-1962 por acharrier, en Flickr

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