Elmarit-R 19 mm f:2,8 (II)

Características

Código - 11 258 - 11 329
Producción - 1990-2009, 5,900+ objetivos
Fabricante: Leica
Variantes: 3-cam, ROM después de 1996
Montura -LEICA R (Acoplamiento mecánico R3-R9, eléctrico R8 y R9)
Ángulo de visión (diagonal, horizontal, vertical): 97°, 87°, 65°
Diseño Óptico:
Número de lentes/grupos 12 /10
Longitud focal efectiva - 19.4 mm
Posición de la pupila de entrada 23.3 mm
Intervalo de enfoque: - 0.3 m a infinito

Escalas: en metros y pies
Campo visual mínimo: 264 mm x 396 mm
Factor de reproducción: 1:11

Diafragma - f:2,8-f:22 con click y valores intermedios, diafragma manual tipo iris de x hojas, totalmente automático

Montura de filtros: revolver incorporado con 4 filtros: Neutro NDx1, amarillo-verde YG, naranja OR, y azul (filtro de conversión KB12)

Parasol: 12546, separado, rectangular encajado, asegurable
Accesorios:

Longitud hasta la bayoneta 60 mm
Diámetro máximo - 71 mm
Material: Aluminio anodizado.
Peso - aprox. 560 g
Inscripción ELMARIT-R 1:2.8/19 LEICA en el barrilete

Diseño:

Referencias

quote icon - Iniciado por Erwin Puts
Around 1990 lens design and precision-manufacturing technology entered a new stage. The second generation Elmarit-R 19mm, designed and manufactured in Solms is a great leap forward in ergonomics, size and performance. There is a time span of 15 years and a change in generation of designers between this version and the older one. It has a smaller front element and the diameter has been reduced by 17mm. With integrated filter turret, internal focusing by rear group movement, 12 lens elements in ten groups and special glass types with anomalous dispersion, the designers created a lens in that small segment of first rank lenses for this specification. This lens shows the progress the Leica designers have made with retro-focus type of lenses. The large front element of the previous version, a classical retro-focus design, has been reduced by stretching the lens and adding more elements in the central section of the optical cell, a design approach that was also employed with other lenses in the wide angle group.

The mechanical construction of a floating element is demanding: the floating lens moves only 0.7 mm from infinity to 0.5 meter and from 3 to 2 meter the lens moves only 0.05 mm! These are tiny mechanical movements and require a high precision construction to function properly after many years of use.

The optical design approach no longer favors only the central portion of the image, but performance has been extended into the corners on the assumption that a wide-angle lens will be employed to capture details that cover the full picture area. This requirement was and is important for the then popular color-slide projections. Optimum quality is reached at 1:5.6 where outstanding image quality can be seen with very fine detail clearly defined over most of the picture area.

From a broader perspective this lens points to the main issue that Leica has to confront with their strategy to focus on lenses with high performance coupled to a fixed focal length. It is true that fixed focal length designs generally deliver the best performance in their class, but the convenience of variable focus lenses has its merits, especially when the image quality is good enough for the task. In the 1990s there is a global trend to capable zoom-lens constructions that Leica was not willing to follow, but their insistence on optical quality and sturdy mechanics could only convince a select group of art photographers. This lens has been sold about 500 times (sic), a sign of the diminishing impact of the R-series in the market.

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