Carl Zeiss Jena DDR Flektogon 20mm F/4

Specifications01

MountEXAKTA

Focal length20mm

Max aperturef/4

TypeWide · Prime

Release year1963

Weight330 g

Filter size77 mm

Min focus distance0.16 m

Aperture blades6

Optical elements10

Groups6

AutofocusNo

StabilizationNo

Aperture controlAperture ring (Manual settings only)

EraFilm era

Production statusDiscontinued

Additional Info02

Lens TypeUltra-wide angle prime lens

Summary02

Carl Zeiss Jena Flektogon is a 20mm f/4 prime wide-angle lens for the Exakta mount, designed for general wide-angle photography. It’s an older manual-focus manual-aperture style lens.

AI-assisted summary — verify against linked sources

Specifications from thelensdb

Where can this lens be adapted?

The Exakta mount has a flange distance of 44.7 mm. A plain adapter fits a camera whose flange distance is at least 1.46 mm shorter. How lens adapters work

Sony EAdapter · 26.7 mm
Canon RFAdapter · 24.7 mm
Nikon ZAdapter · 28.7 mm
Fujifilm XAdapter · 27 mm
L-MountAdapter · 24.7 mm
Micro Four ThirdsAdapter · 25.45 mm
Fujifilm G (GFX)Adapter · 18 mm
Covers full-frame: it can vignette on a medium format sensor.
Canon EF-MAdapter · 26.7 mm

No plain adapter reaches infinity focus on: Canon EF, Nikon F.

Sources03

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Other Mounts03

No alternate mounts are indexed for this family yet.