Apo-Summicron-M 90 mm f:2,0 ASPH

Características

Código - 11 884-negro - 11 885-cromado - 11 632-titanio - 11 636-negro lacado LLC - 177
Producción - 1998- 14,820+ ejemplares
Variantes - Negro anodizado, negro lacado, plateado, y titanio
Montura -Bayoneta Leica M con Códigos 6 bits

Angulo de visión (diagonal, horizontal, vertical) : 35mm (24 x 36 mm) - 27°, 23°, 15°

Diseño Óptico:

Número de lentes/grupos 5/5
Longitud focal efectiva - 90.9 mm
Posición de la pupila de entrada 58.6 mm

Intervalo de enfoque: - 1 m a infinito

Escalas: en metros o pies
Campo visual mínimo:220 mm x 330 mm
Factor de reproducción: 1:9

Diafragma - f/2,0-f/16 con click, valores intermedios, diafragma manual tipo iris de 8 hojas

Montura de filtros: rosca interna E55
Parasol: telescópico

Longitud hasta la bayoneta - 78 mm
Diámetro máximo - 64 mm
Material: Aluminio anodizado
Peso - aprox. 660 g

Inscripción - APO SUMMICRON-M 1:2/90 ASPH.

Diseño:

Referencias

Erwin Puts
Ken Rockwell

Descripción

The two decades from 1990 to 2010 are a period of wide-ranging innovation and research for the Leica optical design department.

The designer team created with zeal a range of lenses for the M- and R-cameras of outstanding quality, optical and mechanical. Modern glass types, extended insight in aberration theory, improved accuracy made possible with CNC machinery and an optimized workflow for assembly and finish have enabled the design and production of high-performance designs. Nowadays these lenses will be primarily attached to digital M-bodies. This combination produces imagery of the highest order.

The Apo-Summicron-M 1:2/90 mm ASPH belongs to the class of best-corrected lenses in the M-line at this moment: it produces a high-contrast-high-definition image already at maximum aperture. Generally the lens has a superb performance over the full sensor area at all apertures.

The only weaker point of the Apo-Summicron-M 1:2/90mm ASPH is its performance at closer distances (0.7 − 2 meter). Here we see some softness and loss of contrast. When optimum quality is required in this distance region, one has to stop down to 1:4. Leica has introduced a new type of mechanism to engage the roller cam of the rangefinder. This allows a wider throat diameter at the back and reduces vignetting.

This 90 mm lens is the second best in the class of 90 mm lenses for the M-system. The 90 mm focal length is the longest that can be used with confidence on the M-body when utilizing the high speed aperture. On the other hand one has to note that this focal length produces very fine imagery with a very natural perspective when looked at from the proper distance.