Rodenstock
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Rodenstock GmbH est un fabricant d'optique basé à Munich, Bavière, Allemagne.
Rodenstock a été fondé en 1877 par Josef Rodenstock et s'est spécialisé dans la fabrication d'objectifs photographiques de haute qualité pour les appareils photographiques et les agrandisseurs (Rodagon, Sironar, Apo-Ronar, Grandagon, Apo-Sironar). La firme a été vendue à Linos AG en 2000, et continue de produire des optiques.
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[modifier] Objectifs pour appareils photographiques petit format
[modifier] Euron
Un 3-éléments, 3-groupes, utilisé pour les caméras 8 mm.
- 37.5 mm f/2.8
[modifier] Eurygon
Un 7-éléments.
[modifier] Heligon
Un 6-éléments.
- 12.5 mm f/1.5
[modifier] Heligaron
Un 6-éléments, utilisé pour les caméras 8 mm.
- 6.5 mm f/1.6
[modifier] Ronar
Utilisé pour les caméras 8 mm.
- 12.5 mm f/1.9
[modifier] Rotelar
Un 5-élements.
[modifier] Yronar
Un 4-éléments, 4-groupes.
- 135 mm f/3.5
[modifier] Ysarex
[modifier] Objectifs pour appareils photographiques grand format
Rodenstock a une longe histoire dans la production d'objectifs pour les appareils grand format, et plusieurs gammes d'objectifs.
[modifier] Geronar
Le moins cher des objectifs Rodenstock, avec 3-éléments, 3-groupes, a un angle de vue de 60°.
- 150 mm f/6.3 (pour 4×5 in)
- 210 mm f/6.8 (pour 5×7 in)
[modifier] APO-Sironar-N
Les APO-Sironar-N sont des 6-éléments, 4-groupes apochromatiques conçus pour la photographie. L'angle de vue est de 72°.
- 150 mm f/5.6 (pour 4×5 in)
- 210 mm f/5.6 (pour 5×7 in)
- 300 mm f/5.6 (pour 8×10 in)
[modifier] APO-Sironar-S
Ces objectifs 6-éléments, 4-groupes sont une amélioration des APO-Sironar-N, avec un plus grand angle de vue (75°) et des verres à très faible dispersion (ED) pour réduire les aberrations chromatiques. Le vignetage des Sironar-N a été réduit.
- 100 mm f/5.6 (for 6×9 cm)
- 135 mm f/5.6 (for 4×5 in)
- 150 mm f/5.6
- 180 mm f/5.6 (for 5×7 in)
- 210 mm f/5.6
- 240 mm f/5.6
- 300 mm f/5.6 (for 8×10 in)
- 360 mm f/5.6
[modifier] APO-Macro-Sironar
This line of 6-element, 4-group macro lenses is optimized for reproduction ratios from 1:5 to 2:1.
- 120 mm f/5.6 (for 4×5 in)
- 180 mm f/5.6 (for 5×7 in)
[modifier] APO-Grandagon
The Grandagon lines are Rodenstock's wide-angle lenses. The APO-Grandagon line is apochromatic, incorporating ED-glass elements. This series has a 120° angle of view, but the extremely short focal lengths only cover mostly medium format image sizes. Designs are 8 elements in 4 groups.
- 35 mm f/4.5 (for 6×9 cm)
- 45 mm f/4.5 (for 6×12 cm)
- 55 mm f/4.5 (for 4×5 in)
[modifier] Grandagon-N
With an angle of view of 105°, these 8-element, 4-group lenses are the standard wide angles of the Rodenstock line. In their respective focal lengths, they are among the fastest wide angles available from any manufacturer. The 90 mm f/6.8, by contrast to the rest of the line, is a 6 element design.
- 65 mm f/4.5 (for 4×5 in)
- 75 mm f/4.5
- 90 mm f/4.5 (for 5×7 in)
- 90 mm f/6.8 (for 4×5 in)
- 155 mm f/6.8 (for 8×10 in)
[modifier] APO-Ronar
These are apochromatic process lenses with 4 elements in 4 groups and an angle of view of approximately 48°. They are optimized for 1:1 reproduction ratios.
- 150 mm f/9 (for 6×9 cm)
- 240 mm f/9 (for 4×5 in)
- 300 mm f/9 (for 5×7 in)
- 360 mm f/9
- 480 mm f/9 (for 8×10 in)
- 600 mm f/9 (for 8×10 in) CL
- 890 mm f/? (for 8×10 in) CL
- an apo ronar 420 mm was produce for copywork also
[modifier] Imagon
Introduced in 1931, the Imagon uses an achromat doublet which is uncorrected for spherical aberration, and the well-known "sink strainer" aperture grilles. It is one of the classic soft-focus "portrait lenses". Though most Imagons are mounted in shutters which have normal (though unmarked) aperture iris controls, the aperture is controlled by one of three supplied aperture grilles. Each grille has an open central portion, noted with an "h-stop" designation which approximates the corresponding f-stop, surrounded by a series of smaller variable-opening holes. By rotating the outer rim of the grille, the opening of these smaller holes can be changed, and by this the amount of softness is also changed. Wider h-stops, or more-open holes, mean more softness.
One hazard of using such a lens is that when rotating the aperture grille, there is the possibility of focus shift. The photographer must verify that the plane of focus is correct after setting the desired amount of softness.
- 200 mm h/5.8 (for 6×9 cm)
- 250 mm h/5.8 (for 4×5 in)
- 300 mm h/7.7 (for 5×7 in)
[modifier] Objectifs pour appareils photographiques numériques
The Rodenstock digital lenses are optimized for the small pixel grids common to most digital caméras' sensors, from 12 μm to 5 μm, to reduce the effects that diffraction and color noise have on sharpness.
[modifier] APO-Sironar digital
These are the standard lenses in Rodenstock's digital lineup. They are optimized for working apertures of f/8 to f/11, and for extremely flat field and uniform illumination.
- 35 mm f/4.5 (for 46×58 mm sensors)
- 45 mm f/4.5 (for 72×96 mm sensors)
- 55 mm f/4.5
- 90 mm f/5.6
- 105 mm f/5.6
- 135 mm f/5.6
- 150 mm f/5.6
- 180 mm f/5.6
[modifier] APO-Macro-Sironar digital
The APO-Macro is optimized for reproduction ratios of 1:5 to 2:1.
- 120 mm f/5.6 (for 72×96 mm sensors)
[modifier] APO-Sironar digital HR
The HR series of lenses is optimized for extreme resolving power, for use with extremely high-resolution (thus the name) CCD sensors, with pixel sizes smaller than 10 μm. Recommended working apertures are f/8 to f/11.
- 35 mm f/4 (for 37×49 mm sensors)
- 60 mm f/4
- 100 mm f/4
[modifier] Objectifs pour agrandisseurs
The current line of Rodenstock enlarging lenses have removeable click-stops for setting aperture in the dark, an illuminated f-stop display, and an aperture pre-set feature, which allows setting of the working aperture, and quick changing from full aperture to the working aperture, for easy focusing and framing.
[modifier] Rogonar
C'est le bas de gamme des objectifs d'agrandisseur, avec 3 lentilles. Ils sont optimisés pour les rapports d'agrandissement de 2x-8x.
- 50 mm f/2.8
- 75 mm f/4.5
[modifier] Rogonar-S
La gamme Rogonar-S 4-éléments, 3-groupes est optimisée pour des rapports d'agrandissement de 2x-8x ou 2x-10x, selon les modèles.
- 25 mm f/4
- 35 mm f/2.8
- 50 mm f/2.8
- 60 mm f/4.5
- 75 mm f/4.5
- 90 mm f/4.5
- 105 mm f/4.5
- 135 mm f/4.5
[modifier] Rodagon
Rodenstock's 6-element, 4-group range of enlarger lenses carry very even field illumination, and can be used as on-caméra macro lenses in addition to normal enlarging lenses. Optimum working apertures are 2 stops below maximum aperture.
- 28 mm f/4
- 35 mm f/4
- 50 mm f/2.8
- 60 mm f/4
- 80 mm f/4
- 105 mm f/5.6
- 135 mm f/5.6
- 150 mm f/5.6
- 180 mm f/5.6
- 210 mm f/5.6
- 240 mm f/5.6
- 300 mm f/5.6
- 360 mm f/6.3
[modifier] Rodagon-G
Cette gamme d'objectifs 6-éléments, 4-groupes est optimisée pour les reproductions avec des rapports d'agrandissement supérieurs à 20x.
- 50 mm f/2.8
- 105 mm f/5.6
- 150 mm f/5.6
- 210 mm f/5.6
- 240 mm f/5.6
- 300 mm f/5.6
- 360 mm f/6.8
- 480 mm f/8.4
[modifier] APO-Rodagon-N
The apochromatically-corrected Rodagon-N line features 7-element, 5-group designs, and optimum reproduction ratios of 2x-15x.
- 45 mm f/2.8
- 50 mm f/2.8
- 80 mm f/4
- 90 mm f/4
- 105 mm f/4
[modifier] Rodagon-WA
C'est une série de lentilles grand-angle, permettant un meilleur agrandissement et l'utilisation de lentilles à plus courtes focales. Lles lentilles de la série WA sont composée en 6 éléments dans 4 groupes, et sont optimisées pour les prise de vues 4x à 15x.
- 40 mm f/4
- 60 mm f/4
- 80 mm f/4
- 120 mm f/5.6
[modifier] APO-Rodagon-D
Not necessarily enlarging lenses, these models are optimized for near 1:1 reproduction ratios, for purposes such as duplication of transparencies, or preparation of internegatives. They are 6-element, 4-group designs, and optimum f-stop is 2 stops below maximum aperture.
- APO-Rodagon-D 1x 75 mm f/4 (for 6×6 cm)
- APO-Rodagon-D 2x 75 mm f/4.5 (for 6×7 cm, optimized for 1.2x-2.5x reproduction)
- 120 mm f/5.6 (for 4×5 in)
[modifier] Hawk Anamorphic Lenses
In the late 1990s, Rodenstock was contracted by Vantage Films, Inc., with backing from Lucasfilm, to manufacture a new line of high-speed, high-resolution anamorphic lenses to be used for the Star Wars prequel trilogy. Only the first film ended up being shot with the lenses, the other two were shot on CineAlta HDTV. The lenses are still sold by Vantage Films.
[modifier] Référence
- (en) Cet article est partiellement ou en totalité issu d’une traduction de l’article de Wikipédia en anglais intitulé « Rodenstock GmbH ».
[modifier] Lien externe
- (en) Linos
