Carl Zeiss Jena MC Flektogon 4/50 (1960)

At 230-260 grams, it is light for its format.

Overview

The Carl Zeiss Jena MC Flektogon 4/50 is a medium-format vintage prime cine lens with a quiet reputation. Announced in 1960 and built for the Pentacon Six system, it sits between cine work and stills photography. Owners report sharp, contrasty images with a reserved look, though it has its quirks. The lens is discontinued. It never reached the fame of its faster Flektogon siblings, but people who have used or collected Pentacon Six glass respect it.

It was marketed under several variations of its name, including "Carl Zeiss Jena Flektogon 50mm f/4" and "DDR Flektogon 50mm F/4 [MC]". The lens was designed for the P6 (П6) mount, compatible with the Kiev-6/60 and Pentacon Six cameras. On 6x6 medium format it counts as a wide-angle, with a wide field of view that doesn't turn distortion-heavy. It's manual focus, naturally, and uses a spring-actuated auto diaphragm. That keeps the viewfinder bright until the moment of exposure, then stops down automatically when the shutter fires. According to documentation, the aperture only adjusts when the shutter is released, so the view stays clear during composition.

Specifications

Key Features

7 Elements in 4 Groups Optical Design

The optical formula is 7 elements in 4 groups, a hallmark of the Flektogon series. It's a symmetrical wide-angle design known for controlling distortion while maintaining contrast. This arrangement avoids the complexity of retrofocus designs and relies on careful spacing and cementing to handle the short focal length in SLR systems. It isn't as fast as other medium-format lenses of the era. The 4/50 puts even illumination and geometric fidelity across the frame first. The design reflects its dual role: capable in stills, but built with the consistent rendering needed for motion work.

Spring-Actuated Auto Diaphragm

The spring-actuated auto diaphragm keeps the lens wide open during focusing and composition, which maximizes viewfinder brightness on the often-dim screens of medium-format SLRs. At the moment of exposure, the camera's linkage triggers the spring mechanism, and the blades snap to the preset aperture. There's no electronic coupling and no complex mechanical levers, just spring tension and linkage alignment. It can degrade over time if not maintained. Users note that when it works correctly, the transition is snappy and reliable.

MC Multi-Coated Optics

The MC designation indicates multi-coated elements, a refinement introduced in later production runs to improve contrast and reduce flare. Earlier non-MC versions exist, but the coated variant handles backlit scenes with more composure, with cleaner highlights and deeper blacks. The coating is subtle, not the aggressive broadband type seen in later eras, but it makes a measurable difference in real-world use, particularly under mixed lighting or with strong directional sources. Owners report that it gives a balanced, film-like tonality that pairs well with both color and black-and-white emulsions.

Collectibility & Value

Collectors note that the Carl Zeiss Jena MC Flektogon 4/50 carries known risks. "Beautiful Schneideritis on this one" is a phrase that surfaces in forum discussions, pointing to cement separation between lens elements as a recognized failure mode. User reports also cite oxidation of optical groups and a front optical assembly that can become loose, sometimes "pogoing" in the barrel during handling. Functional examples are not guaranteed, even at premium prices. Listings on the secondary market often say whether a lens has been CLA'd (Clean, Lubricate, Adjust), and condition descriptors like "[MINT]" appear, though they should be viewed skeptically without verification. No original price or current market valuation data is documented, but the lens trades within enthusiast circles as part of complete Pentacon Six or Kiev 60 systems.

eBay Listings

Carl Zeiss Jena Flektogon 4/50 lens Pentacon Six

$100

FLEKTOGON 4/50 Carl Zeiss Jena Medium format for Pentacon Si

$100

Carl Zeiss Jena Flektogon MC 4/50mm f/4 50mm mount Pentacon

$299

Carl Zeiss Jena Flektogon 4/50 RED MC MINT Condition Pentaco

$349

As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.