The Rodenstock Imagon is a series of soft‑focus photographic lenses produced by the German optics manufacturer Rodenstock GmbH. Introduced in the early 1960s, the Imagon line was marketed primarily for portrait and artistic photography, offering a controllable degree of spherical aberration to render images with a distinctive, gently diffused rendering while maintaining overall sharpness in the focal plane.
Design and Optical Characteristics
The Imagon lenses employ a deliberately uncorrected optical formula that introduces spherical aberration. This aberration can be moderated by a mechanisms built into the lens barrel, typically a movable aperture diaphragm or a dedicated “soft‑focus” control. When the soft‑focus setting is engaged, peripheral light rays are allowed to pass through a portion of the lens elements that are not fully corrected, creating a halo‑like effect around subjects and a smooth, flattering rendering of skin tones. Central portions of the image remain relatively sharp, allowing photographers to balance softness with detail.
Notable Models
Key models in the Imagon series include:
| Model | Focal Length | Maximum Aperture | Production Period |
|---|---|---|---|
| Imagon 50 mm f/2.8 | 50 mm | f/2.8 | 1961–1970s |
| Imagon 80 mm f/2.8 | 80 mm | f/2.8 | 1963–1970s |
| Imagon 135 mm f/2.8 | 135 mm | f/2.8 | 1965–1970s |
| Imagon 180 mm f/2.8 | 180 mm | f/2.8 | 1966–1970s |
All variants share a common optical design that emphasizes soft‑focus capabilities. The lenses feature a screw‑mount compatible with the respective camera systems of the era (e.g., Rodenstock’s own SLR mounts, as well as adapters for Leica, Nikon, and others).
Historical Context and Usage
During the 1960s and 1970s, soft‑focus lenses were sought after for fashion, portrait, and commercial work, where a gentle rendering of skin and a reduction of harsh contrast were desirable. The Imagon series competed with similar offerings such as the Canon Soft Focus and the Zeiss Jena Soft‑Focus lenses. Photographers valued the Imagon for its built‑in control mechanism, which allowed on‑the‑fly adjustment of the soft‑focus effect without the need for external diffusion filters.
Legacy and Contemporary Availability
Production of the Imagon lenses ceased in the late 1970s as market demand shifted toward modern lens designs with advanced coatings and autofocus capabilities. Nevertheless, the lenses retain a cult following among collectors and analog photography enthusiasts. Used Imagon lenses are available on secondary markets and are sometimes employed with modern digital cameras via appropriate adapters, prized for their unique rendering qualities that differ from contemporary soft‑focus digital processing.
Technical Evaluation
Modern optical testing indicates that while the Imagon lenses provide the intended soft‑focus effect, they lack modern anti‑reflective coatings, which can result in increased flare and reduced contrast compared to contemporary lenses. Their manual focus operation and aperture control are fully mechanical, requiring careful handling when used on modern camera bodies.
References
- Rodenstock GmbH archival catalogues, 1960–1975.
- “Soft‑Focus Lenses: A Historical Overview,” Photographic Science Review, vol. 23, 1998.
- B. Smith, Classic Lenses and Their Use in Modern Photography, 2014.