Carl Zeiss Tessar 50mm f/3.5 Macro

Carl Zeiss Tessar 50mm f/3.5 Macro

The Carl Zeiss Tessar 50mm f/3.5 Macro is a dedicated focusing head made for the Zeiss Ikon Contaprox I close-up and reproduction system. It is mechanically different from the regular rigid Contax Tessar and therefore requires a separate profile.

The assembly contains a four-element, three-group Tessar lens and its own helical focusing mechanism. The factory specified a focusing range from approximately nine inches, or 0.23 metres, to infinity before additional extension tubes were installed.

The focusing head does not couple to the Contax rangefinder. Critical focusing is instead performed on the Contaprox ground-glass adapter using a five-power magnifier. After focusing, the ground-glass assembly can be exchanged for the Contax camera body through the system's standard bayonet interface.

Although the head can be incorporated into broader bellows and reflex accessory configurations, its primary factory application is Contaprox I. It must not be confused with the separate Panflex Tessar 115mm f/3.5.

The Macro Tessar is a non-coupled focusing head for the Contaprox I workflow. Its four-element, three-group optics, independent helicoid and approximately 0.23m near limit serve ground-glass focusing and extension-tube work. It is not the regular body-focused Contax standard lens.

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Optical qualities

Rendering

The lens retains the clear, high-resolution character associated with the classic Tessar formula. Its primary purpose is technical close-up, copying and reproduction work rather than general handheld rangefinder photography.

Close-up performance

The supplied 1x extension tube allows approximately 1.1:1 magnification. Optional 2x and 4x extension tubes increase the reproduction ratio further. Period factory documentation specifies magnifications of approximately 2x and 4.1x with those individual tubes, or up to approximately 6.1x when all three are combined.

Sharpness

Stopping down increases depth of field and improves consistency across a flat subject. Apertures around f/5.6 to f/11 are generally more practical for reproduction than f/3.5, although diffraction becomes progressively relevant at the smallest settings.

Optical identity

No separate optical formula has been established for the West German macro head. Its independent profile is justified by its dedicated helicoid, non-coupled operation, ground-glass workflow and extension-tube compatibility rather than by a proven optical recalculation.

At maximum aperture

Maximum-aperture performance should be evaluated with a correctly calibrated camera. A coupled rangefinder measures distance through a mechanical cam and does not inspect the image plane directly. Small errors in the body, mount or lens can therefore shift the sharp plane. Subject movement and field curvature may also be mistaken for optical softness. A clean, properly assembled lens should be tested at several distances before conclusions are drawn.

The widest setting provides the greatest light transmission and the least depth of field available from the design. Contrast can be reduced by residual aberrations, internal reflections or aged coatings. Bright point sources may show glow or flare. These effects vary between examples and should not be presented as a fixed signature of every surviving lens.

Stopped down

Closing the diaphragm increases depth of field and generally improves consistency across the 35mm frame. Middle apertures are often the practical choice for documentary work, landscapes and architecture. The smallest aperture provides more depth but is not automatically the sharpest setting because diffraction gradually reduces fine contrast.

Aperture shape depends on blade count and mechanical condition. Oil, bent blades or an incorrectly assembled iris can change both operation and out-of-focus highlights. Published blade counts should remain tied to the exact barrel version rather than copied between mounts.

Handling and compatibility

Contax and Kiev rangefinder lenses use either the internal standard-lens bayonet or the external bayonet. These interfaces serve different mechanical purposes even though they belong to the same camera system. Similarity to Nikon S or another rangefinder mount does not guarantee correct registration, coupling or infinity focus. A suitable adapter must reproduce the required focusing mechanism and keep the rear assembly clear of internal camera parts.

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History

Development and Launch

A Contaprox Tessar focusing head was introduced in Jena in 1947. By approximately 1950, optical production for the West German version had transferred to Oberkochen and examples appeared with Zeiss-Opton markings. Later heads carry Carl Zeiss branding.

This profile covers the West German Zeiss-Opton and Carl Zeiss generation. The earlier Jena-made head belongs to the Carl Zeiss Jena production history.

Production Evolution

The focusing head was catalogued as 563/04 during the 1950s and later as 11.1814. It remained available in the Zeiss Ikon Contax catalogue in 1960.

Special Editions/Variants

Known variations include metric and feet focusing scales, Zeiss-Opton and Carl Zeiss engravings and differences in the supplied accessory set. These do not require separate optical profiles.

Collector Notes

A complete Contaprox I outfit normally includes the Tessar focusing head, ground-glass adapter, focusing magnifier and 1x extension tube. These components are frequently separated, so completeness materially affects usability and collector value.

Check the helicoid, exposure-correction scale, diaphragm, ground glass, magnifier and bayonet interfaces. The absence of rangefinder coupling is intentional and not a defect.

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Sources

• Zeiss Ikon Contax Catalogue, 1956pacificrimcamera.com →
• Zeiss Ikon Contax IIa and IIIa Catalogue, 1960pacificrimcamera.com →
• Pacific Rim Camera: 50mm f/3.5 Tessar and Contaprox historypacificrimcamera.com →
• Leitz Auction: Contaprox I with Carl Zeiss Tessar focusing headleitz-auction.com →