Carl Zeiss Jena Biometar 35mm f/2.8 (1950)
A compact wide-angle lens with a simple optical design and fully manual control.
Overview
The Carl Zeiss Jena Biometar 35mm f/2.8 is a wide-angle prime lens produced in 1950, made for rangefinder systems of the era. It gave photographers a capable fixed focal length lens. The 35mm focal length suits street photography, documentary work and interior shots - places where showing the space around the subject mattered.
Owners report a no-frills build around a 5-element, 4-group optical formula. That layout was typical of the period and aimed to correct aberrations without overcomplicating the design. The diaphragm is manual, run by a physical aperture ring, with nine blades forming the iris. That gives relatively smooth bokeh for its class, though not exceptional by modern standards. Focusing is entirely manual, through a focusing ring that couples with the rangefinder mechanism on compatible bodies.
It was offered with both T and M mounts, though documentation confirms its primary association with the Contax M-mount, which suggests use on specific rangefinder cameras of the time. The minimum focusing distance is 0.90 meters. That limits close-up work, but it was standard for lenses not designed as macros. No data exists on coating technology or angle of view. The optical layout points to an emphasis on contrast and resolution within the limits of mid-century glass and manufacturing tolerances.
No contemporary reviews, user testimonials or performance critiques have been documented in available sources. Individual units do turn up, such as one bearing serial number 3211668 listed in a Dominic Winter auction, which confirms the lens has been on the secondary market. There is no verified data on original pricing, weight, filter size or common mechanical failures.
Specifications
| Manufacturer | Carl Zeiss Jena |
| Focal Length | 35mm |
| Maximum Aperture | f/2.8 |
| Lens Mount | M (Contax M-mount) |
| Optical Construction | 5 elements in 4 groups |
| Minimum Focusing Distance | 0.90m |
| Diaphragm | Manual diaphragm |
| Aperture Blades | Nine aperture blades |
| Focusing | Manual focus only |
| Manual Focus Control | Focusing ring |
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