Ultra-wide 20mm f/4 Flektogon for Exakta mount with distinctive Zeiss Jena rendering.
The Carl Zeiss Jena Flektogon 20mm f/4 is an ultra-wide-angle lens in Exakta bayonet mount, representing one of the widest available lenses for Exakta-system cameras. The Flektogon name denotes Zeiss Jena's retrofocus wide-angle designs, which became widely respected for their optical quality and distinctive rendering character.
Optical quality is impressive for such a wide angle, with the retrofocus design delivering sharp results across the frame when stopped down to working apertures. The lens handles distortion well for a 20mm optic of its era. Multi-coated versions offer improved contrast and flare resistance over earlier single-coated examples.
Build quality is solid East German engineering with an all-metal barrel and smooth focusing mechanism. The lens is reasonably compact considering the extreme wide-angle field of view. The Exakta bayonet mount can be adapted to modern mirrorless cameras, where the Flektogon's distinctive rendering finds new appreciation.
Sought after by vintage lens enthusiasts and adapted mirrorless shooters, the Flektogon 20mm f/4 delivers a dramatic ultra-wide perspective with characterful rendering. On the used market, it offers extreme wide-angle capability at prices well below modern equivalents, particularly appealing to creative photographers who value distinctive vintage optics.